Mother said she was glad she never let her hair be cut.为什么用be cut 直接用cut不行吗?let sth done 和let sth be done 区别是什么let sth done 本身不就是被动的意思吗

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Mother said she was glad she never let her hair be cut.为什么用be cut 直接用cut不行吗?let sth done 和let sth be done 区别是什么let sth done 本身不就是被动的意思吗
Mother said she was glad she never let her hair be cut.为什么用be cut 直接用cut不行吗?
let sth done 和let sth be done 区别是什么
let sth done 本身不就是被动的意思吗

Mother said she was glad she never let her hair be cut.为什么用be cut 直接用cut不行吗?let sth done 和let sth be done 区别是什么let sth done 本身不就是被动的意思吗
have her hair cut 中,可以不用 be.而 let her hair be cut 中,需要用 be.
虽然 have 和 let 都是使役动词,但是,have sth.do 的用法,是使用 have 表示让他人为你做某事,比如：i'd like to have my hair cut,my watch repaied,my room cleaned,都是让别人为你剪头发,修表,打扫房间.这里,使用 have + 宾语 + 不带 to的不定式做宾补.宾语 hair,watch,room 都是动作的接受者,宾补是那个动作.换句话说,have sth do 本身带有被动的含义.
而 let 不同,它构成的 let + 宾语 + 宾补,没有被动的含义.如果要表示被动的概念,宾补部分用 be done.举例：主动语态：I let him go,Jane's father let her see me in hospital.Don't let him die!被动语态：John let his car be washed yesterday.Jane let her watch be repaired in the shop.We'll never let our old friends be forgotten.

let sb do 表示让某人做某事
let sth be done 表示让某事被做
此题中头发是被剪，所以用be done
cut 过去式和过去分词还是cut

主动和被动的关系啊，而且是let sb. do 没有let sth. done啊，真的没有啊……

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