情態助動詞（modal auxiliary verb）

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情態助動詞 (Modal Auxiliary Verbs) 是帶有意義的助動詞，整裡用法如下，幫助大家快速掌握。
8 m1 m7 ]1 d* S2 B1. 表能力: can/could
7 t" C! ^; H9 G' k, v! I" G4 Y1 `can表示現在及未來的能力, could 表示過去的能力
8 o; k/ [, t8 }# F9 t0 B- lShe can speak several languages. 她會說好幾種語言
She couldn't dance well. 她以前不太會跳舞
! D9 m' x0 e' y5 d7 y2. 表允許: can/could, may
4 [3 `) C  o+ ?" w! l尋求對方允許
Can I borrow your car? 我可以借你的車嗎?
Could I borrow your car? (較禮貌)
May I borrow your car? (較正式且禮貌)
給予許可
9 m" N1 L, w, ZYou can stay at my place if you like. 如果你想住我家的話，可以喔
- X0 {2 ~+ y) {" m( R  o- FYou may stay at my place if you like. (較正式)
) i0 p2 X% D' n; s" J5 t7 b有權利(被允許)做某事
) F7 d$ U$ G7 a" N8 o0 k5 c' H+ DStudents can buy discount tickets. 學生可以買優惠票
$ L. i0 S" U0 lStudents may buy discount tickets. (較正式)
3. 表請求: can/could, will/would
Can you take a message? 可以幫我留言嗎?
Will you take a message?
較禮貌的說法
Could you take a message?
Would you take a message?
; x1 k; K& |( e, o4. 表建議或提議: should, could
建議用should
You should visit Taipei 101 on weekdays. 你最好平日去台北101
提議用could
We could meet at the weekend. 我們可以約週末見面
$ e( c2 A: |+ c5 B0 v& j5. 表可能性: may/might, could
I may/might be late, so don't wait for me. 我可能晚點到，所以不要等我
& |# R, U: t- ^: U(may=might, 用法及意思沒有差異)
Most accidents in the home could be prevented. 大部分的家中意外都是可以避免的 (有避免的可能性)
※ may/might 語意上比較像是強調"不確定感"。 could則是表達"其實某件事是有可能發生的"，這樣的語意主要強調另一方面(比較少人認為會發生的那一面)的可能性
6. 表必須: must
You must follow the regulations. 你必須遵守規則

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