if it had not been for the snow ,we could have climbed the mountain yesterday.这句话对吗,帮我分析一下知识点.

If it had not been for与If it were not for有什么区别? You couldn't have had all your work done ______ .A.if it was not for me B.if had it been for us C.it had not been for me D.had it not been for me If there had not been 改成 had not there been 是had not there been 还是had there not been? ------------for the heavy rain.i should have been here earlier A if it were not B were it notC had it not been D if it wasn't __for the rain ,the construction work would have been faster A If it were not B Were it notC Had it not been D If it hasnt _____ the clouds ,you would find the airplane in the sky easily.A Had it not been for B If it were not C If it had not been for D Were it not for选什么?为什么? if it had not been for ..句型对吗if it had not been for your timely assistance in giving me first aid,I fear that the consequences might have been much serious.这句话的开头：if it had not been for...,是if it is not 的过去完成时? If it had not been for your help,I would have been late for school,改成倒装句式 Had it not been by an accident if it had not been forIf it had not been for your help,i could not have done it.这个句子里有2个it前面这个做主语的it指什么(后面的it不用讲了)?若你是高手,请多举几个包含有if it were / if it had been的例子帮 ____for your help,we wouldn't have succeeded.A,Hadn't it been B,Had it not been C,If it had been D,If it were但是A和B的区别在哪儿? If it _ for the rain,we _ the picnic yesterday.A were not; could have hadB were not; could haveC had not been; could have had If it were not for… If it had not been for … but for… 有什么关系和区别,请高手详细讲解,谢谢 _____ for you help,we might have got lost in the forestA.Had it notB.Had it not beenC.If it were notD.If we had not been选哪个?为什么? ______ his advice,we'd better have been cheated.A.If you don't give us B.Had it not been for C.If it were not for D.Should it not for ()for the snow yesterday ,we would have gone to climb the mountain.a,if it were not b.had it not been c.if it was not d.were it not 求详解语法句式 If it had not been raining too much,the crops would grow much better.If it had not been raining too much,the crops would be growing much better.求解这句可不可以用下面的互换If it had not been raining too much,the crops would grow much be 怎么是用had been啊,were不可以吗?If it ________ yesterday afternoon,I would have gone fishing.A.had not been raining B.were not rainingC.would not be raining D.should not be raining