今天要談的英文文法是關於「時態句」，只要能清楚掌握時間點，只要看到If + S + had + p.p.…, S +類似題型時，記住副詞子句要用過去完成式，這是不變的用法，這樣是不是文法就變得更加清楚明白了呢！

(  ) If only _____ too much, the car accident wouldn’t have happened.

(A) I had drunk  (B) I had not drunk  (C) had I drunk  (D) had I not drunk

這題是考第三條件句的用法，代表與過去的事實相反：

If + S + had + p.p.…, S + would (could, might, should, ought to) + have p.p.…

If you had called me yesterday, I would have come.

副詞子句用過去完成式，這是固定用法。根據句意，我要是沒喝這麼多的酒，車禍就不會發生，所以答案是(B)。

※更多關於字彙的補充，請參考「國考英文字彙一把抓」。