Question

IV. Поставьте глагол в скобках в нужную форму
1. If they did all sums, they (get) better marks.
2. If she were more sociable, she (have) a lot of friends.
3. If I (know) about it yesterday, I could have come to help you.
4. If I (know) how to type, I would buy a typewriter.
5. If she (answer) his letter then, they would have been married all those years and neither of them would be lonely now.

помогите пожалуйста, вот это я делал сдавал где ошибки не пойму

Answer 1

1. If they did all sums, they WILL GET better marks. 
2. If she were more sociable, she WOULD HAVE a lot of friends. 
3. If I KNEW about it yesterday, I could have come to help you.
4. If I KNEW how to type, I would buy a typewriter.
5. If she DID NOT ANSWER his letter then, they would have been married all those years and neither of them would be lonely now.
Удачи)

Answer 2

1. If they did all sums, they would get better marks
2. If she were more sociable, she would have a lot of friends
3. If I knew about it yesterday, I could have cone to help you
4. If I knew how to type, I would buy a typewriter
5.If she answered...