1

here is the sentence

"We've had to order a part that's only made overseas and it will take few days to get here"

but why not just "we've ordered a part......"

Does it mean the obligation has already been done?

1

Present Perfect tense: Sub + have + V3

this tense shows the just completed actions in present.

eg:(1):

i have gone to the post office to buy some cards.

eg:(2): conversation:

John: Why didn't you come to the Movie?

Rosee: I have hadto go to buy a medicine for our neighbors, so i didn't come.

Sub + have+ V3 (Here had is past participle)

(here John should have gone to the movie if didn't to go for medicine)

Have + had to + V1 also gives the same meaning as should, must, ought to in Past period

Past Perfect tense: Sub + had + V3

this tense shows the just completed actions in past period.

eg:

i had gone to the post office to buy some cards.

Have to: have to + V1

have to gives the same meaning like should, must, ought to with present and future meaning.

eg:(1): conversation:

John: let us go to the movie?
Rosee: i have to go to buy a medicine for our neighbors, so i won't come.

(here John would have gone to the movie if need not to go for medicine)

eg:(2):

i have to go to the post office to buy some cards.

eg:(3):

we have to wear a uniform in our school.

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