Past Simple or Present Perfect
The scientist (to write/ already) his article.
Andrew’s hamster (to eat / just) his food.
The boys (to find / yesterday) an old cage in their garden.
They (not / discuss / yet) the problem.
Charles (to finish / just) his translation.
They (go) to the theatre last week.
My cousin (be) to the theatre three times this week.
His niece just (write) the invitation letters.
Helen (come) home, (have) a short rest, and then (begin) to help her mother.
…. your relatives (take part) in the demonstration yesterday.
…. your parents (tell) you about the project today.
Yesterday my aunt (go) shopping and (buy) apples for a cake.
Don’t buy pizza! I already (make) an apple pie.
Let’s have breakfast! I (set) just the table.
My mother is angry. My elder brother (not / take out) rubbish.
What plants you (water) so far?
I (visit) my uncle and aunt last Saturday?

The scientist has already written.Andrew's hamster has just eaten.The boys found an old cage in their garden yesterday.They have not duscussed the problem yet.Charles has just finished his translation.They went to the theatre last week.My cousin has been to the theatre three times this week.His niece has just written the invitation letters.Helen came home, had a short rest, and then began to help her mother.Did your relatives take part in the demonstration yesterday?Have your parents told you about the project today?Yesterday my aunt went shopping and bought apples for a cake.Don’t buy pizza! I have already made an apple pie.Let’s have breakfast! I have just set the table.My mother is angry. My elder brother hasn’t taken out rubbish.What plants have you watered so far?Did I visit my uncle and aunt last Saturday?