Question

aaay

教えてください🙏

8 Underline four more present perfect sentences in
the article. Then circle the correct options in these
sentences (a-d).
a We know / don't know exactly when the activities
or situations started.
b The activities or situations started in the past.
They have / don't have an effect on the present.
c The present perfect is used with for / since and
the point of time when the activity started.
d The present perfect is used with for / since and a
period of time.
TH