介词能做主语吗?If the car should break down on the way,you would have to walk back 句首IF不就是介词吗?

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介词能做主语吗?If the car should break down on the way,you would have to walk back 句首IF不就是介词吗?
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介词能做主语吗?If the car should break down on the way,you would have to walk back 句首IF不就是介词吗?
介词能做主语吗?
If the car should break down on the way,you would have to walk back
句首IF不就是介词吗?

介词能做主语吗?If the car should break down on the way,you would have to walk back 句首IF不就是介词吗?
介词不能做主语.打个比方,介词就是建筑水泥,把名词和其它单词粘合起来,构成借此短语.
记住,介词永远在名词前面.
in the afternoon;
on the morning of May 1st;
onto the desk...

晕!
谁说句首的一定是主语。
if那句的主语是 car, 主句的主语是you.

这里the car是主语,而if引导的是条件状语从句,这里用虚拟语气

IF根本就没有做主语啊...
它也做不了

我先说下一般情况:介词是不做主语的,但介宾短语则可以作主语。
具体到这句话中,if在这做连词(尽管它有介词的词性,但这不是),引导了一个句子,还用到了虚拟语气。
整句话的意思是:万一车坏在半路上,你就不得不走回来。