The question is how to put it into practice.
My question is when to leave.
His dream is to be a doctor.
Her work is to look after the babies.
注意:1.不定式在句中作表语时,对应的谓语动词用单数。
2.当助于是不定式时,表语不能用Ving形式,可用不定式。
如:To see is to believe. (眼见为实)
独立结构。如:
To tell you the truth, I don’t agree with you.
To make matters worse, it began to rain.
不定式的时态和语态
不定式的时态
现在时: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。如:
He seems to know this.
I hope to see you again.
完成时:表示的动作发生在谓语动词表示的动作之前。如:
I’m sorry to have given you so much trouble.
He seems to have caught a cold.
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。如:
He seems to be eating something.
完成进行时:表示动作从过去某个时间开始,一直延续到现在,并有可能持续下去。如:
She is known to have been working on the problem for many years.
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