靜網PWA視頻評論

情態助動詞用法簡述

2023年11月14日

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dare, need
① dare作情態動詞用時, 常用於疑問句、否定句和條件從句中, 過去式形式為dared。
eg. How dare you say such horrible words to me?
② need 作情態動詞用時, 常用於疑問句、否定句,相當於肯定句中一般用must, have to, ought to, should。
eg. Need I finish the work today?
Yes, you must. / No, you needn't.
③ dare和 need作實義動詞用時, 有人稱、時態和數的變化,在肯定句中,dare後面常接帶to的不定式,在疑問句和否定句中,dare後面可接帶to或不帶to的不定式,而need後面只能接帶to的不定式。
eg. She doesn't dare (to)answer.
She needs to cook dinner for her sisters.
五. shall, should
① shall 用於第一人稱,徵求對方的意見。
eg. What shall I do ?
② shall 用於第二、三人稱,表示說話人給對方的命令、警告、允諾或威脅。
eg. You shall be punished,you bad boy!
六. will, would
① 表示請求、建議等,使用would使語氣更加緩和。
eg. Would you give me a cup of coffee, please?
② 表示意志、願望和決心。
eg. I will never do that again.
③ would表示過去反覆發生的動作或某種傾向。
eg. During that summer, he would visit me every other day.
④ 表示估計和猜想。
eg. It would be about may when she come back to China.
七. should, ought to
① should表示“應該”,ought to表示義務或責任,語氣更嚴重。
eg. I should help her because she is in trouble.
You ought to take care of her because she is your daughter.
② 表示勸告、建議和命令,should, ought to可通用,但在疑問句中常用should。
eg.Should I open the window?
③ 表示推測, should , ought to (客觀推測), must(主觀推測)。
eg. She must pass the exam. (斷定)
She ought to/should pass the exam.(不太肯定)

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