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yubraj
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Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For examples: To play, To do, To work, To cancel. etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

We do use Perfect infinitive after some verbs. For more information,

check: http://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked

 

Reporting an earlier event in the passive voice

If the reporting happens in the present and reported event in past we use the structure : Reporting an earlier event in the passive voicesubject+passive reporting verb+To infinitive or perfect infinitive

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure For an example: subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past.

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For examples: To play, To do, To work, To cancel. etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

We do use Perfect infinitive after some verbs. For more information,

check: http://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked

Reporting an earlier event in the passive voice

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past.

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For examples: To play, To do, To work, To cancel. etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

We do use Perfect infinitive after some verbs. For more information,

check: http://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked

 

Reporting an earlier event in the passive voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

For an example:

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past.

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

added 181 characters in body
Source Link
yubraj
  • 2.9k
  • 24
  • 75
  • 113

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For examples: To play, To do, To work, To cancel. etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

We do use Perfect infinitive after some verbs. For more information,

check: http://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked

Reporting an earlier event in the passive voice

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past.

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For examples: To play, To do, To work, To cancel. etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

Reporting an earlier event in the passive voice

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past.

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For examples: To play, To do, To work, To cancel. etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

We do use Perfect infinitive after some verbs. For more information,

check: http://dictionary.cambridge.org/grammar/british-grammar/perfect-infinitive-with-to-to-have-worked

Reporting an earlier event in the passive voice

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past.

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

added 39 characters in body
Source Link
yubraj
  • 2.9k
  • 24
  • 75
  • 113

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For exampleexamples: To play, To do, To work, To cancel.

I etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

Reporting an earlier event in the passive voice

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past, Therfore, you should write "To have cancelled' Instead of "To cancell".

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For example: To play, To do, To work, To cancel.

I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

Reporting an earlier event in the passive voice

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past, Therfore, you should write "To have cancelled' Instead of "To cancell"

Your sentence to be filled is:

They ______ their trip at the last moment.

If you filled this sentence with "Are believed to cancelled", It would be grammatically wrong, Because we use TO With Base form of verb. For examples: To play, To do, To work, To cancel. etc. I think this sentence should be filled as follows:

They are believed to have cancelled their trip at the last moment.

Here, 'To have cancelled' is perfect infinitive form which works best in the your sentence.

Perfect form of infinitive is called Perfect infinitive. A Perfect infinitive is formed with To have+past participle And it refers to a time before that of the preceding verb. For an example:

I'm glad to have studied at that school.

( Here the speaker is glad that he/she has studied at that school)

Here, am is the preceding verb. I'm glad refers to the present and 'To have studied' refers before of being glad.

Reporting an earlier event in the passive voice

source: http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice

If the reporting happens in the present and reported event in past we use the structure : subject+passive reporting verb+To infinitive or perfect infinitive

He is believed never to have smiled at anyone.

Now, It should be clear to you that in your sentence reporting happens in the present and reported event is in past.

They are believed= reporting in the present

To have cancelled the trip at the last moment= Reported event is in the past

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yubraj
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yubraj
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  • 113
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