1) 一般式表示的动词,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,例如
He seems to know this. 他似乎知道这事。
I hope to see you again. = I hope that Ill see you again. 我希望再见到你。
2) 完成式表示的动作发生在谓语动词表示的动作之前。例如:
Im sorry to have given you so much trouble. 很抱歉,给你添了那么多的麻烦。
He seems to have caught a cold. 他好像已经得了感冒。
3) 进行式表示动作正在进行,与谓语动词表示的动作同时发生。例如:
He seems to be eating something. 他好像正在吃什么东西。
4) 完成进行式表示动作从过去开始并延续至说话的时候。例如:
She is known to have been working on the problem for many years. 我们知道她研究这问题有好几年了。
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