[問題] 高中遠東版第五冊第二課文法(if not for..)

[boo317 (我想隨心所欲)]

這一課的文法提到 if not for
可以使用but for
或是 if it had not been for/it were not for來替換使用

想請問的是 if it had not been for和it were not for
使用時機有什麼不同嗎

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推 darknest:had not been:與過去事實相反假設; were:與現在事實相反
→ darknest:假設?