A.
1. If I came home later I would have very little free time.
2. If he had known my adress he would have come to my place (так и просится дальше: and smash my face).
3. I was not well prepared for the examination. I wish I had learnt the material better.
4. If I had seen you yesterday I would have given you the money I owe you.
5. If I had known that you needed my help I would have helped you at once.
6. If I were in your place I would act differently.
7. If I had a computer I would play games and do nothing else.
B.
1. I would be late for the lesson, if I missed the bus.
2. I would have come to you, if I had had an opportunity to do it.
3. I would have given you my text-book, if I hadn't left it at home.
4. I would have helped you if I had known how to do it.
5. I wouldn't buy the book if I knew that it was boring.
6. It would be better if I had more time to work at my self-improvement.
Пара комментариев по примерам под буквой B. (под A сами подумайте по аналогии, где настоящее, а где анриал).
1, 5, 6 примеры - Нереальное настоящее - условие уже не выполнится, т.к. упущен шанс в либо его выполнение нереально/маловероятно в будущем (напр., если бы я был президентом, то я бы...).
Главное: would (not) + глаг. в инфинитиве без to
Придаточное: If... глаг. в Past simple
2, 3, 4 пимеры - нереальное предположение о другом варианте развитий событий в или сожаление о чем-то (вот если бы я оделся тогда потеплее, то потом не заболел бы).
Главное: would (not) + have + глаг. в Participle II.
Придаточное: If... глаг. в Past Perfect.
