Have done; did

Have done; did
 

-For those who:cool: have done:cool: (or did?) the exercise in class, please ignore this email.

(from an email sent to the students who were absent)

IN CLASS is like yesterday, which requires the simple past; do you think HAVE DONE is wrong?

Both 'have done' and 'did' are valid and you'll hear both used. Which one is used depends on what point of view the speaker takes about the action.

Good answer. Thank you.