Ii. раскройте скобки, поставьте глаголы в past simple или past perfect. 1 when the teacher (to enter) the classroom, the students already (to open) their books. 2 my friend (to show) me a mobile phone which he (to buy) the day before. 3 the teacher (to understand) that john (not to prepare) for the exam well enough. 4 we (to return) from the cinema by nine o’clock. 5 i (to do) all my work at six o’clock. 6 she said that she (to spend) her holiday in spain. 7 then he (to come) to the shelf, (to take) one book and (to begin) to read it. 8 i just (to find) the money i was looking for. 9 when your friend (to return) from the south? – he (to return) yesterday. 10 they (to leave) england when he (to be) a child. 11.you (to see) peter? – i (not to see) him since last month

Я правда не все знаю, и не точно. Так что, заранее извиняюсь.
5)i have doing
6)she hase just spended
10)they have leaving
Это которые в Perfect

1 When the teacher entered the classroom, the students had already opened their books. 
2 My friend showed me a mobile phone which he had bought the day before. 
3 The teacher understood that John hadn't prepared for the exam well enough. 
4 We had returned from the cinema by nine o’clock. 
5 I had done all my work by six o’clock. 
6 She said that she had spent her holiday in Spain. 
7 Then he came to the shelf, took one book and began to read it. 
8 I had just found the money I was looking for. 
9 When did your friend return from the South? – He returned yesterday. 
10 They left England when he was a child. 
11. You (to see) Peter? – I (not to see) him since last month  - тут я считаю не корректный вопрос, так как перфект в настоящем времени нужно использовать, а не в т.е. Have you seen Peter? - I haven't seen him since last month.