I could do it if I_____you.这里为什么要填were 而不是 was?

If I could do it all again Could you help me do some cleaning tomorrow? If I ______, I will do it. I would appreciate it (if you do sth./ if you did sth./ if you could do sth.)都可以吗?I would appreciate it (if you do sth./if you did sth./ if you could do sth.)都可以吗? I could do it if I_____you.这里为什么要填were 而不是 was? If l could do it all over again,i never would have broken Up with I hope we could do it next time if not that critical. I would appreciate it if you could do me a fever高中的 i can work whenever i want now make me proud i know you can do it if i could . ( )that ,I could do it much better.A、A.If I do B、B.If I were do C、C.Were I to do D、D.Were I do I could not do it before my if you could do anything tomorrow what would it be? if I could do anything还是 something for you If you can do it ,I can do it .翻译.. I can do it if you kissme if you i do not believe it Would it impress you if I could”这句话是什么意思 if everything could come again i'll think it I would appreciate 【 】 very much if you could ofI would appreciate 【 】 very much if you could offer me some advice on how to do it.a）it b）you为什么不能写you?