在can/may/must/will/shall/have to/had better/should/would/might/could/used to/ought to/needn't/后面都是用be.不用变化.建议句中省略should时也不用变.I think he be there.
be动词除了情态动词不用变am is are之外还有什么时候不用变成am is are
在can/may/must/will/shall/have to/had better/should/would/might/could/used to/ought to/needn't/后面都是用be.不用变化.建议句中省略should时也不用变.I think he be there.