【Sherry Hsu】評論
2.表示與過去事實相反的假設或想像,<副詞子句的<動詞用<過去完成式,{主要子句}<動詞用<助動詞+<HAVE+{過去分詞}。 If I had visited the place before, I would have known the way. 如果我去過那個地方,我就認識路了。If Margaret had slept(過去完成式) more, she would not have had trouble(助動詞+have+過去分詞) staying awake during chemistry lecture yesterday
【Dex Shih】評論
If Margaret had slept more, she would not have hadtrouble staying awake during chemistry lecture yesterday.