Помогите ПОЖАЛУЙСТА С определение времени, и как правильно нужно построить текст? а то у меня не получается

Question

1) I (to return) home rather late yesterday 
2) Where is Petrov? -He (to work) at the library 
3)Mary (to return) to Moscow in 2005 
4)She (to learn) English by the end of last year 
5)The teacher just (to come) 
6) I (not to work) at 8 o'clock tomorrow. I (to finish) my homework by that time 
7)The students (to have) exams every term 
8) I (to do) my homework when you come 
9) He will come if you (to ring) him up 
10)She (to cut) her finger while she (to cut) the bread

Nastena · Accepted Answer

1) I (to return-PAST SIMPLE) home rather late yesterday
2) Where is Petrov? -He (to work-PRESENT CONTINUOUS) at the library
3)Mary (to return-PAST SIMPLE) to Moscow in 2005
4)She (to learn-PAST-SIMPLE OR PAST PERFECT) English by the end of last year
5)The teacher just (to come-PRESENT PERFECT)
6) I (not to work-FUTURE CONTINUOUS) at 8 o'clock tomorrow. I (to finish-FUTURE PERFECT) my homework by that time
7)The students (to have-PRESENT SIMPLE) exams every term
I (to do-FUTURE CONTINUOUS) my homework when you come
9) He will come if you (to ring-PRESENT SIMPLE) him up
10)She (to cut-PAST SIMPLE) her finger while she (to cut-PAST CONTINUOUS)
the bread

Таблицы всех английских времен с примерами и упражнениями

Елена Князева · Answer

returned 
is working 
returned 
learnt 
has came 
won't be working 
have 
was doing 
ring 
cut / was cuting

Андрей Пронин · Answer

1) I returned home rather late yesterday. 
2) Where is Petrov? -He is working at the library. 
3)Mary returned to Moscow in 2005. 
4)She had learnt English by the end of last year. (Интересно, как это ей удалось? :-)) 
5)The teacher has just come. 
6) I shan't be working at 8 o'clock tomorrow. I shall have finished my homework by that time. 
7)The students have exams every term. 
8) I was doing my homework when you cAme. Или: I shall be doing... when you come. 
9) He will come if you ring him up. 
10)She cut her finger while she was cutting the bread

Алена · Answer

returned 
is working 
returned 
learnt 
has (just) come 
won't work 
have 
will do 
ring 
cut / was cutting