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问题: Yet all my dad did was reach for his toast 什么意思??

同上,这是英语阅读理解中的句子,这应该是个系表结构吧。。。?
reach for his toast应该是做表语的,那么reach应该用动名词啊。。。
困惑~~

解答:

Yet all my dad did was (to)reach for his toast.
to省略了。
不定式短语作表语

然而,我爸当时所能做的一切就是伸手去拿他的烤面包片。

不定式作表语表示具体动作或将来动作;动名词作表语表示抽象的一般行为。
①To be kind to the enemy is to be cruel to the people.
②My chief purpose is to point out the difficulties of the matter.
③What I would suggest is to put off the meeting.