英语介词to的怎么用？

Question

I will go home to do my homework,和do not let him swim in the river|，第一句中加to，为什么第二句中不加to？

Answer 1

英语介词to的用法有哪些
一：表示相对，针对

be strange (common, new, familiar, peculiar, distinct, sensitive, immune, vulnerable, indispensable) to

Air is indispensable to life.

Aircrafts are vulnerable to interference caused by radiation.

This injection will make you immune to infection.

二：表示对比，比较

1：以-ior结尾的形容词，后接介词to表示比较，如：superior ,inferior,prior,senior,junior

The quarrel happened prior to my arrival.

2: 一些本身就含有比较或比拟意思的形容词，如equal，similar，equivalent，analogous

A is similar to B in many ways.

3：表示一些先后顺序的形容词，如：second,subsequent,next,preliminary,preparatory

Subsequent to the war,they returned to their hometown.

4: to也偶尔出现在个别动词之后,与动词形成固定词组,表示比较,如:prefer to,compare to,in contrast to

compare to sth.表示比喻或比拟,而compare with sth.表示比较,如:

World is usually compared to a stage

Compared with his past,he has changed a lot.

Prefer的正确句型是:prefer A to B或prefer doing A to doing B,但当prefer后接动词不定式时,表示比较的介

词to就要改成rather than ,如:

The undaunted soldier preferred death to surrender.

Many people prefer spending mon

Answer 2

go 后面动词不定式需加 to
let 后面动词不定式不需要加 to