Which to use - didn't or hadn't
Didn’t and hadn’t both refer to events in the past. Which you use depends on the context.
If the action in question cannot be completed, use the past simple form of didn’t. The action occurred in the past and can't be changed in the present.
If there’s still a possibility for the task to be completed, use the past perfect form of hadn’t. The event occurred in the past and can be changed in the present.
Assume there are three people, Tom, Mary and Joe.
Example 1 - “Tom read Marys’ report where she spoke with Joe who said he didn’t finish painting the wall.” This implies the painting of the wall was not completed and Joe is no longer capable of doing so.
Example 2 -“Tom read Marys’ report where she spoke with Joe who said he hadn’t finish painting the wall.” This implies the painting of the wall was not completed and Joe has the ability to do so.
This second example doesn’t tell the whole story, however, because we don’ know what Joe’s intentions are. You could write, “hadn’t yet finish painting the wall.” This indicates Joe intends to finish. You could also write, “hadn’t finish painting the wall yet.” This implies Joe could finish but has shown no indication he wants to.
If the action in question cannot be completed, use the past simple form of didn’t. The action occurred in the past and can't be changed in the present.
If there’s still a possibility for the task to be completed, use the past perfect form of hadn’t. The event occurred in the past and can be changed in the present.
Assume there are three people, Tom, Mary and Joe.
Example 1 - “Tom read Marys’ report where she spoke with Joe who said he didn’t finish painting the wall.” This implies the painting of the wall was not completed and Joe is no longer capable of doing so.
Example 2 -“Tom read Marys’ report where she spoke with Joe who said he hadn’t finish painting the wall.” This implies the painting of the wall was not completed and Joe has the ability to do so.
This second example doesn’t tell the whole story, however, because we don’ know what Joe’s intentions are. You could write, “hadn’t yet finish painting the wall.” This indicates Joe intends to finish. You could also write, “hadn’t finish painting the wall yet.” This implies Joe could finish but has shown no indication he wants to.
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