would用于假设,后接原形不定式与完成时有什么区别

来源:百度知道 编辑:UC知道 时间:2024/05/16 19:45:49
用法或意义上有何不同??

would do表示对现在 和将来的事情进行假设
If he were here now, he would help us.
If it were fine tomorrow, we would go outing.

would have done表示对过去的事情进行假设
If he had been here yesterday, he would have helped us.

would to do 表示对现在 和将来的事情进行假设
would have done 是表示对过去的事情进行假设