to do可以做动词的宾语，现将to do做宾语的例句具体解析如下：
She forgot to lock the door.
她忘记锁门了。
He begins to understand the truth.
他开始明白真相。
They decided to buy the house.
他们决定买这房子。
The prisoner managed to escape.
囚犯设法逃跑了。
The woman offered to help us.
这女士提出要帮助我们。
当宾语后有宾语补足语时，常用it作形式宾语的情况:
find/think/consider/believe/make…+ it +宾语补足语+ 不定式（真正宾语）
We find it difficult to understand.
我们觉得这难以理解。
They think it a great idea to buy a present for you.
他们觉得给你买礼物是个好主意。
You make it impossible for us to trust you.
你让我们无法信任你。
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