I need a pen to write with.with一类的介词有时在句末,有时又没有,这是什么语法?

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/25 15:03:11

当不定式动词是不及物动词时,应加相应介词.
The room is too small for us to live in.
The ice is too thin to skate on.
the chair is very comfortable to sit on.
I have a firend to wait for.
这些不定式都是不及物动词,所以后面的介词不能省略.
The book is difficult to understand.
understand是及物动词,所以后面不跟介词.

I need a pen to write with.with一类的介词有时在句末,有时又没有,这是什么语法? I need a pen to write 和 I need a pen to write with那句对?为什麽? I need a pen to write 和 I need a pen to write with那句对? 为什麽? Will you lend me a pen to write with?最后的介词问什么用with?语法点是什么? I need a chair to sit on.I need a pen to write with. I need a pen _______A.to write B.to write with C.writing D.w i have a pen to write还是/write with （I have a pen to write with）句中为什么加 with I use a pen to write.还是I use a pen to write with.为什么? 为啥动词又是后面要加介词而有时又不要.并且动词都是在句末的那种 I have no pen to write with Do you have any pens?I need a pen to write _______ 我知道要用with