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1. 語氣助動詞:must (1) 表「必要」 must

+ 原形動詞

You

must

eat something.

你得吃點東西。

We

must

follow the rules.

我們必須遵守規則。

He

must not

leave.

他不得離開。

I go there?

我一定得去那嗎?

Must

★ must 有「必須、得」的意思。 ★ 否定句"must not …"譯為「不得、不准」,是強制和命令的語氣。 ★ 縮寫:must not = mustn't

(2) 表「推測」 must

+ 原形動詞

You

must

be very angry.

你一定很生氣。

He

must

know it.

他一定知道這事。

He

must not

be at home.

他一定不在家。

★ must 也可表達當然之推測,意思是「一定、八成」。

2. 語氣助動詞:should 表「應該」 should

+ 原形動詞

You

should

go to bed early.

你應該早點上床睡覺。

He

should

read more.

他應該多閱讀。

We

should not

park here.

我們不應該把車停在這。

Should

I tell him?

我應該告訴他嗎?

★ should 有「應該」的意思,所有人稱都適用。常用句型為"I think ... should V" (我想...應 該...) ★ 縮寫:should not = shouldn't ★ should 和 have to 的語意不同,should 表「應該做」,但未必會做;have to 表「不得不做」, 不想做但非

做不可。請比較以下例句:

Jack should leave, but he decides to stay. (傑克應該離開,但是他決定留下。) Jack wants to stay, but he has to leave. (傑克想留下來,但是他非離開不可。)

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