最佳答案:must 是情态动词.所以要接动词原形了如:The teacher said,"You must get back before 10 o'clock."---
最佳答案:一、seem to be seem是一个实意动词,其后要用助动词构成反疑问句.如:It seems to be a good book,doesn't it?二
最佳答案:LIKE TO DO STH/LIKE DOING STHWANT TO BE A/ANTELL SB ABOUT STH1 a happy day2 give
最佳答案:看句子前面,如果有动词后面就是用前面那个动词,比如你举得例子,前面动词是was,后面就是用was,如果是其他动词,就用那个动词,如果没有动词,就是用助动词了,句