小学英语语法备考指南：不定式的时态和语态（二）
小学英语语法备考指南：不定式的时态和语态（二）1) 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。
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