GRAMMAR FOCUS
I. Without/But for/Were it not for ....
Without/But for/Were it not for .... 都是當「要不是……」解。這個句構是一種假設語氣的用法，用以表達與現在事實或過去事實相反的事。
與現在事實相反：
Without/But for/Were it not for/If it were not for + N ..., S + would/should/could/might + V ....
與過去事實相反：
Without/But for/Had it not been for/If it had not been for + N ..., S + would/should/could/might + have p.p. ....
與現在事實相反：
If + S1 + were/p.t. ..., S2 + would/should/could/might + V ....
與過去事實相反：
If + S1 + had + p.p. ..., S2 + would/should/could/might + have p.p. ....
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