For how long should I walk?What can I help you with?For how long should I walk?What can I help you with?这两句英语为什么要加介词for和with

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ForhowlongshouldIwalk?WhatcanIhelpyouwith?ForhowlongshouldIwalk?WhatcanIhelpyouwith?这两句英语为什么要加介词for和

For how long should I walk?What can I help you with?For how long should I walk?What can I help you with?这两句英语为什么要加介词for和with
For how long should I walk?What can I help you with?
For how long should I walk?
What can I help you with?
这两句英语为什么要加介词for和with

For how long should I walk?What can I help you with?For how long should I walk?What can I help you with?这两句英语为什么要加介词for和with
这个没有什么为什么,就是这么说话的.
I help you with something,而不是I help you something.
所以问的时候就是What can I help you with?
第二个 For how long should I walk?其实和How long should I walk for?是一样的,都可以.
I walk for an hour,而不是I walk an hour.
所以问句就应该是How long should I walk for?把介词放到句首也可以For how long should I walk

for +时间,表示时间段,For how long should I walk? 我应该散步多长时间?
What can I help you with? 陈述语气是这样 I can help you with what,我可以帮您做些什么,因为后面要加名词所以要加介词with,如果是Can I help you?就不用加了。
都是语法上面的性质,不加不完整...

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for +时间,表示时间段,For how long should I walk? 我应该散步多长时间?
What can I help you with? 陈述语气是这样 I can help you with what,我可以帮您做些什么,因为后面要加名词所以要加介词with,如果是Can I help you?就不用加了。
都是语法上面的性质,不加不完整

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