1) My friend came back from business trip yesterday. Our teacher has asked me twice today.
2) The plane has just landed. He gave me his notes last week.
3) She has sent three letters to this firm already. They did the exercises quickly yesterday.
4) The workers have gone to the meeting already. He asked many questions last lesson.
5) I have spoken with my boss already. They went to the seaside by train last summer.
Объяснение:
Past Simple Tense:
1) Действие закончилось в
2) Есть указатель времени в вчера, на неделе летом, в 2001 году и т.п.
Present Perfect:
1) Когда произошло действие неважно, важен результат: самолет приземлился, письма отправили, работники уже ушли.
2) Отрезок времени не указан или еще не закончился: сегодня (сегодня еще не закончилось), на этой неделе (эта неделя еще продолжается), в этом году (этот год все еще продолжается) и т.п.
I can watch TV in my room. I can play ches and computer games in my room.
I can do my homework in my room.
I mustn't run and play with ball in my room. In my room I mustn't. listen to too loud music! I mustn't spill water and break any things in my room.
I mustn't eat any food in my room. I mustn't draw on the walls of my room.