If it were not for… If it had not been for … but for… 有什么关系和

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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

If it were not for 是对现在的虚拟,意思是：如果不是因为或若不是.如.If it were not for the bad weather now ,we would go outing .
If it had not been fo是对过去的虚拟,意思和上面一样,如 If it had not been for the bad weather yesterday,we would have gone outing .
but for若不是,也用在虚拟句中,如 But for your help,I could not have finished the work on time yesterday.(But for your help= If it had not been for your help)

If it had not been for与If it were not for有什么区别? if it had not been for if it had not been for ..句型对吗 If it had not been for the accident we______much earlier. If it had not been for your help,I would have been late for if it were not for my father,my life would not have been so if it had not been for your help ,i couldn't have done it. Thank you very much indeed.If it had not been for your advic if it had not been for the snow ,we could have climbed the m If it had not been for literature,the well-known writer Rowl Were it not for 英语造句要求：1.句中必须同时有定语从句和虚拟语气2.三个句子分别用到but for/if it were not fo