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1. If I (to realize) it was to be like this, I (not to come).
2. If he (not to tell) us that himself I never (to believe) that.
3. Even if I (to see) her at the party I (can, do) nothing for you.
4. Don't you think it (to be) very much for the better if you and I both (to keep) quiet?
5. If anyone (to ask) me what his specific gift was, I ( not to know) how to answere.
6. She said she (to be) pleased if my mother (to allow) me to spend a month with them.
7. Mary is staying with them. I think it (to be) a good thing if you (to come) and (to see) her.
8. If we ever (to happen) to meet again I (to act) as if this letter never (to write).

1. If I realized it was to be like, I come. 2. If he hadn`t told us that himself I would have never believed that. 

3. Even if I saw her at the party I could do nothing for you. (хотя здесь может быть и: Even if I had seen her at the party I could have done nothing for you.) 4. Don't you think it will be very much for the better if you and I both keep quiet?  5. If anyone asked me what his specific gift was, I wouldn`t know how to answer.  6. She said she had been pleased if my mother would have allowed me to spend a month with them.  7. Mary is staying with them. I think it will be a good thing if you come and see her. (or: I think it would be a good thing if you came and saw her.)  8. If we ever happened to meet again I would have acted as if this letter had never written.