Past Simple or Present Perfect The scientist (to write/ already) his article. Andrew’s hamster (to eat / just) his food.

The scientist has already written his article. Andrew\'s hamster has just eaten his food. The boys found an old cage in their garden yesterday. They haven\'t discussed 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. Your relatives took part in the demonstration yesterday. Your parents have 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 rubbish out. What plants have you watered so far? Did I visit my uncle and aunt last Saturday?