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不定式形式1) 一般式：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。一般为：动词+ to do something
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) 完成式：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)进行式：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)完成进行式：
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
疑问词
疑问词who,what,which,when,where,whether,how后可接不定式构成不定式短语，在句中作主语、宾语、表语等。如：
①When to leave for London has not been decided yet. （不定式在句子中做主语）
②Mr. Smith didn't know whether to leave or stay there. （不定式在句子中做宾语）
③I asked Professor Xu how to learn English well. （不定式在句子中做直接宾语）
④The question was where to get the medicine needed. （不定式在句子中表语）
以上例句中疑问词+不定式部分，均可转换为相应的从句形式。
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