let
单词辨析：
指允许某人做某事，常后接不带 to 的动词不定式作宾补，语义最弱；也指任由或有意地促使某事发生。通常不用被动语态。
Some people seem to let their kids do whatever they like.
一些人似乎允许自己的孩子随心所欲。
She lets her children play in the garden.
她让孩子们在花园里玩耍。
He let the ball fall to the ground.
他任由球掉落在地上。
指允许某事发生或某人做某事，可后接双宾语，语义较弱。
My father does not allow me to smoke.
我父亲不许我抽烟。
He was allowed to enter the room.
他被允许进入房间。
She is allowed one item of hand luggage.
允许她携带一件手提行李。
尤指根据正式决定、规章或法律允许某事发生或某人做某事，可后接双宾语，语义最强。
They didn't permit me to speak a word.
他们不准我讲一句话。
The task doesn't permit any delay.
这项任务不允许有任何耽搁。
Who permitted their leaving early?
是谁允许他们提早离开的?
The doorman permitted them entry to the film.
门卫允许他们进去观看电影。
相关例句：
If he wants to do that, let him do it
他要做，就让他做好了。
I let the tyres down on his car
我把他的汽车轮胎放了气。
Thorne let him talk
索恩让他畅所欲言。
How could she know about that? He'd certainly never let drop any hint
她是怎么知道的？他绝对没有走漏半点风声。
She let go of Mona's hand and took a sip of her drink
她放开莫娜的手，抿了一口饮料。
In therapy, she began to let go of her obsession with Mike
在心理治疗中，她开始逐渐放下对麦克的痴迷。