Pencils are used to write with 同义句是pencils are used for writing为什么后面的句子没with 了这是老师说的.她说也没什么依据 拜托哪位乐于助人滴告诉偶.

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Pencils are used to write with 同义句是pencils are used for writing为什么后面的句子没with 了这是老师说的.她说也没什么依据 拜托哪位乐于助人滴告诉偶.
Pencils are used to write with 同义句是pencils are used for writing为什么后面的句子没with 了
这是老师说的.她说也没什么依据 拜托哪位乐于助人滴告诉偶.

Pencils are used to write with 同义句是pencils are used for writing为什么后面的句子没with 了这是老师说的.她说也没什么依据 拜托哪位乐于助人滴告诉偶.
be used to 不定式,后面只能接动词原型.
be used for doing 用了介词for ,可以接动名词.
意思都是“被用来做……”.
这里还有个问题
write with和write的用法
i have a pencil to ------write with要 用笔来写——还原i write with a pen.
i have a letter to ------write要写信——还原i write a letter.
给你多个例子方便你理解
i want to find a hotel to stay in——还原成 i stay in a hotel.
i want to find somewhere to stay ——还原成i stay somewhere
这里的somewhere 是个副词,可以直接加动词后面.
有些用法是固定的,比如write with 还有一楼说的listen to,要记住哈.