Could you ask him to call me，please? 请你让他给我打个电话，好吗?

[特别提醒]使役动词let，make，have等，感官动词see，hear，feel，watch，notice，look at，listen to等，后常跟不带to的不定式作宾语补足语。例如：

A woman saw it happen when she was walking past. 一位妇女路过时看到(它掉下)了。

We often heard her sing in the next room. 我们经常听到她在隔壁唱歌。

注意：在被动语态句子中，不定式前必须加to.例如：

He was made to do it. 他被迫做这件事。

She was often heard to sing in the next room. 经常听到她在隔壁唱歌。

四、不定式短语作定语要放在被修饰的词语之后。例如：

I have a lot of work to do. 我有许多事情要做。

五、不定式短语作主语时，常用it作形式主语，真正的主语不定式短语放在后面。例如：

It is right to give up smoking. 戒烟是有益的。

六、作表语。例如：

To him，the first important thing was to save lives. 对他来说，最重要的事情就是拯救生命。

His wish is to become a scientist. 他的愿望是当一名科学家。

七、动词不定式用在疑问词how，when，where，what，which等之后，作宾语或宾语补足语。例如：

He taught us how to use a computer. 他教我们如何使用计算机。

I don't know where to go? 我不知道去哪里。