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.

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.