一个句子中有了动词后面再有动词前面要加to后面跟动原 不同时态不定式用法 现在时:一般现在时表示的动词,有时与谓语动词表示的动作同时发生,有时发生在谓语动词的动作之后. He seems to know this. I hope to see you again. = I hope that I'll see you again. 我希望再见到你. 2) 完成时:表示的动作发生在谓语动词表示的动作之前. I'm sorry to have given you so much trouble. He seems to have caught a cold. 3)进行时:表示动作正在进行,与谓语动词表示的动作同时发生. He seems to be eating something. 4)完成进行时: She is known to have been wreaking on the problem for many years. 一般在表示情绪的动词后加to do也表将来