1.A:Shall we go out to play football?
B:I'm afraid we can't.It's raining now.
→If it (weren't raining now),the boys (would go out to play football).
2.A:Linda won't come today,will she?
B:No.She has a bad cold.
→If Linda (didn't have a bad cold),she (would come today).
3.女:Why don't you call Mary now,Tom?
Tom:I don't have her telephone number with me.
→If Tom (had Mary's telephone number with him),he (would call her now).
此三题都是对现在情况的假设,此时if从句用一般过去时（be动词一律改成were）,而主句用“would/could/might + 动词原形”做谓语.