people need energy to live./ to live with.哪个是对的啊!我记得有一句话 是 I need a pen to write with.这里需要介词with

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people need energy to live./ to live with.哪个是对的啊!我记得有一句话 是 I need a pen to write with.这里需要介词with
people need energy to live./ to live with.
哪个是对的啊!我记得有一句话 是 I need a pen to write with.
这里需要介词with

people need energy to live./ to live with.哪个是对的啊!我记得有一句话 是 I need a pen to write with.这里需要介词with
1、people need energy to live.
不定式“to live”做的是状语,此时可以把to改成"in order to",因为live可以做不及物动词,所以全句很完整.不需要加with.
2、I need a pen to write with.
不定式“to write with”做的是定语,修饰a pen,此时write作不及物动词,并与该名词构成动宾关系,即“write with a pen”,所以需要带相应的介词.
3、此外,write也可作及物动词,如:write a composition (作文).
“我有一篇作文要写”就可以写成:I have a composition to write.
根据2、3句可以知道,不定式作定语时带不带介词,关键要看不定式与其所修饰的名词之间需不需用到介词.

people need energy to live. / to live with. 两句都是对的 只是加与不加说这句话时强调的地方不一样
people need energy to live 我们需要活力来继续生活,强调to live
people need energy to live with 我们需要用来继续生活的活力,强调energy~

补充一点,energy此处应译为“能源”