my hair is too long.im going to have it cut.为什么这里要用cut?而不是用cuts?

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have done
固定搭配,使某事被做

我想知道你为什么会觉得要用cuts。

have...cut 是固定用法。

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这里have是使役动词，使役动词的用法见下：
　　使役动词 (例子）Causative verb 　
1.使役动词是表示使、令、让、帮、叫等意义的不完全及物动词,主要有leave.get.keep.make(使,令), let(让), help(帮助), have(有；让；从事；允许；拿)等。　　
2.使役动词后接受词,再接原形不定词作受词补语。　　接宾语时，人称代词用宾格。
He made me(宾格) laugh. 　　他使我发笑。　
let him go. 　　我让他走开。
I helped him repair the car. 　　我帮他修理汽车。
Please have him come here. 　　请叫他到这里来。
3.使役动词还可以接过去分词作受词补语。　
I have my hair cut every month. 　　我每个月理发。

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have sth do...固定搭配，语言这东西是人们长期生活中约定俗成，没有什么为什么的。

这里是个句型：have sth. done 指请某人做某事 cut这里是cut的过去分词

你觉得前面有个it，所以以为它是要加s是吧，学英语有时候思维固定了就会这样，没事的，多看就能灵活一些啦，加油噢

这儿的cut是过去分词，不是一般现在时。。。所以构成have。。。done的结构。因为it表示my hair，my hair 和cut是一种被动的关系

My hair( )long A.is.B.are. my hair is long改同义句 The teacher is always saying my hair is too long .that's right .I think it's better ____ it . 选择：My hair is too long.I want to have it ( ) this Sunday.My hair is too long.I want to have it ( ) this Sunday.A,cut B,to cut C,cutting D,cutted 求一道英语填空题答案,my hair is too long,i'll have __cutA it B them my hair is too long,i will ----tomorrow!Acut it Bhave it cut 为什么是B?A哪里错了 My hair is too long,I want to have it_____ (cut) 用所给单词的适当形式填空 my hair is too long.im going to have it cut.为什么这里要用cut?而不是用cuts? my hair is too long,so i muset have it()A cut B to cut选哪个为什么 My hair is long.Mary's hair is longer.Mary's hair ______ ______ ______ mine. my hair _ long my hair am long. Tim needs to cut his hair because his hair is too long.(改为同意句) 填空：Your hair is too long.You have to k_____ your hair short. She has long hair too (改为同义句） ____ hair is ___long The girl with long curly hair is my cousin.对with long curly hair 提问 My sister is tall with long hair.对 tall with long hair进行划线提问 I have long hair.My sister has long hair too.(改为同义句) —— —— ——have long hair.