с английским, где 7-8 класс

1 if it hadn't been cold, they wouldn't have lit the fire.
2 if she studied more, she would be a better student.
3 they would have seen the Queen if they hadn't visited London on that day.
4 if you should win that competition, you would be rich.
5 if i lived in France, l would speak French well.
6 if they had locked the doors, the burglars wouldn't have got in.
7 we'll have a party if Alan passes his driving test.
8 i would give John your message if i should see him today.
9 they wouldn't have had any money if their cousin hadn't lent them some.
10 those plants won't grow if you don't water them.
11 i would buy that bag if it were cheaper.
12 if she ... (open) the letter, she would have been surprised.

Времена меняются по схеме на одну ступеньку вниз в а именно:
Present simple становиться Past Simple
Present Continuous- Past Continuous
Past Simple и Present Perfect оба меняются на Past Perfect
Future Simple - Future in the past
Past Perfect не меняется
Pas Continuous либо остается либо меняется на Past Perfect Continuous
Повелительные предложения строятся по схеме:
( He) asked ( somebody) to do something
( He ) told ( somebody) to do something
Отрицательный вариант
(He) asked ( somebody) not to do something
( he) told ( somebody) not to do something