Let的用法

A: Verb=动词
1.让 = I let them borrow the car; let the air out of the balloon; Let me see your drawing.
2.允许 = let the dog in; let the construction job to a new firm.
3.出租 = House to let; He lets his house to visitors in the summer. 出租

B: Noun=名词
1. Police are free to investigate without let or hindrance 干扰
2. the majority of new lets are covered by the rent regulations 租

C.: Let alone 不干涉; let down 使失望 [ Please don't let me down ]; let go 放开 [Please let go of my coat] ; let off 饶恕; let in/let out...

1）当let后只有一个单音节动词，变被动语态时，可用不带to 的不定式。
　　 They let the strange go.---> The strange was let go.
　
　2） 若let 后宾补较长时，let 通常不用被动语态，而用allow或permit 代替。
　　The nurse let me go to see my classmate in the hospital.
　　----> I was allowed / permitted to see my classmate in the hospital.

你好，没有
let （sb） to do

但是，有let sb do

一般情况需要.使役动词被动情况需加上to。例如：
They let him talk.
He was let to talk.

They made him run.
He was made to run.

但有一种情况例外，就是let go. He has been let go.他被放了。
Let go，是一个非常固定的短语，指放了某人。我们经常在美国的动作片里听到这个词。因为用得实在太多了，所以被动的时候人们还是习惯用let go。
语法上，let to go也是可以的。

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