A. Common Error :

1. Bush should not said that yesterday. 2. We should came early.	Bush should not say that yesterday. We should come early.
“should (not)” is always followed by the bare infinitive, although it can be used for present, past and future situations.
一、 因為“should (not)”可以用於現在、過去及未來等時態(tenses)， 故有許多同學誤把其後的動詞時態轉變，而忘記用原形動詞(bare infinitive)，即“should come”，“should do”，“should say”； 二、 像“should”一樣，“can”、“may”、“might”、“would”等皆稱為“情態動詞”(modal verbs)，它們往往展示該句子的語氣，無論是甚麼時態，其後都應用原形動詞: can(not) go, could (not) go, may (not) go, would (not) come, should (not) eat ......

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