即使我求他，他也不肯帮我这个忙。

He ___wouldn't help me with this favor even if I begged him.

要不要来杯咖啡，休息一下？

___Wouldn't you like a cup of coffee for a break?

如果他们早点出发，就不会错过火车了。

If they had left earlier, they ___wouldn't have missed the train.