不定式的逻辑主语

不定式的动词的发出者即为不定式的逻辑主语。不定式的逻辑主语通过在不定式前加上“for/of + 施动者”来表示。

1) for + 名词(代词) + 不定式
* It's not good for you to smoke so much. 抽太多的烟对你没好处的。
* How would it be for me to look after the machine? 我来看这台机器怎么样?
* Do you consider it worthwhile for them to make that experiment? 你认为他们做这试验值得吗?
* There are a lot of difficulties for them to overcome. 多困难需要他们克服。
* I stepped aside for her to pass. 我站到一边让她过去。
* This is for you to decide. 这得由你决定。

2) of + 代词 + 不定式
* It's very nice of you to help me with my work. 帮我的工作，你真是太好了。
* It was silly of us to do so.我们这样做真是太傻了。