一个英语问题：I'll sweep the floor if you (would) clean the desks a

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一个英语问题：I'll sweep the floor if you (would) clean the desks and chairs.
句子如题,我想知道为什么括号中要用would?if引导的从句的时态都要比主句的退后一步吗?

这句话可以这样理如果是虚拟语气的话,就是一个错误的句子.
应该为：i'll sweep the floor if you clean the desks and chairs.
或者
i would sweep the floor if you would clean the desks and chairs.
看你是高中的题还是初中的题.

一个英语问题：I'll sweep the floor if you (would) clean the desks a 1.would you please sweep the floor sweep the floor clean the floor区别 would you like to sweep the floor?同义句 You must sweep the floor. I (sweep) the floor now. 英语卷I cen sweep the floor划线句子提问?(在sweep the floor下面提问) 选择填空1.A:Could you please sweep the floor?B:_______.I have to sweep the floor、clean the windows、wash clothes动词原形 I have to sweep the floor to make it ____ _____（look clean). the floor is so clean,i wonder who_____(sweep）it 拖地是不是mop the floor,可不可以用clean the floor,扫地是不是sweep the floor