Contractions: 'would' vs 'had'

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Contractions: 'would' vs 'had'

助动词wouldhad都可被缩写成 'd。那怎么分别这两个单词呢?
•  Would后面总跟着一个不带to的动词不定式:
I'd like some sugar please. 我想要一些糖,谢谢。
I'd be glad to meet you. 遇见你很高兴。
•  Had后面跟一个过去分词,用以将动词变位成过去完成时:
When I arrived, she'd been in my office for two hours. 当我到达时,她已经在我的办公室里两个小时了。
Until he bought his sports car, he'd been saving money for years. 他常年省钱,直到他购买了运动轿车。
注意: 其他一些表达(had better, had best...)中用了had,而后面不是过去分词:
I'd better leave. 我最好离开。

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