2 added 2 characters in body
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Use 'when' to indicate that one event happens while another event is ongoing:

1) We were walking, when suddenly a car stopped in front of us...

2) I was reading a book when he entered the room.

3) I was cleaning it when it broke

(note that was broke would imply that it'it' was out of money).

Use 'when' to indicate that one event happens while another event is ongoing:

1) We were walking, when suddenly a car stopped in front of us...

2) I was reading a book when he entered the room.

3) I was cleaning it when it broke

(note that was broke would imply that it was out of money).

Use 'when' to indicate that one event happens while another event is ongoing:

1) We were walking, when suddenly a car stopped in front of us...

2) I was reading a book when he entered the room.

3) I was cleaning it when it broke

(note that was broke would imply that 'it' was out of money).

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source | link

Use 'when' to indicate that one event happens while another event is ongoing:

1) We were walking, when suddenly a car stopped in front of us...

2) I was reading a book when he entered the room.

3) I was cleaning it when it broke

(note that was broke would imply that it was out of money).