let的用法：let可作名词和动词，作名词时，意为出租、租借等；作动词时，意为允许、许可、同意等。固定搭配：let sb do sth 允许某人做某事，be let to do sth 某人被允许做某事。
一、let作为动词，意为允许;让;准许;许可;同意;允许(去某处)。
1、当意为允许的含义时，例句有：
He'd eat chocolate all day long if I let him.
我要是不拦着，他会整天不停地吃巧克力。
Let them splash around in the pool for a while.
让他们在水池里扑腾一会儿吧。
2、当意为准许；许可；同意等含义时，例句有：
She wanted to lend me some money but I wouldn't let her.
她想借给我一些钱，可我不同意。
They won't let him leave the country.
他们不许他离开这个国家。
3、当意为允许（去某处）时，后接副词或者介词，例句有：
I'll give you a key so that you can let yourself in.
我把钥匙给你，你可以自己开门进去。
The cat wants to be let out.
那只猫想要出去。
二、let还可以作为名词，意为擦网球;出租;租借。例句有：
I asked him if he had any rooms to let.
我问他是否有房屋出租。
Business languished, and she hung out a Room to Let card.
生意冷清，她挂出了出租房屋”的招牌。
He used to let out cars by the day.
他惯常按日出租汽车。
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