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。
1. 表能力: can/could
3 m7 F$ u6 A5 U& K7 Xcan表示現在及未來的能力, could 表示過去的能力
She can speak several languages. 她會說好幾種語言
& @  R! i8 K7 T1 yShe couldn't dance well. 她以前不太會跳舞
2. 表允許: can/could, may
尋求對方允許
$ s2 U! u1 ?' e: DCan 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
You can stay at my place if you like. 如果你想住我家的話，可以喔
2 Y( X* y3 n1 b8 n6 o. aYou may stay at my place if you like. (較正式)
有權利(被允許)做某事
, y! j6 ]& F  [, ~3 ]+ o0 q) VStudents can buy discount tickets. 學生可以買優惠票
Students may buy discount tickets. (較正式)
0 O' D3 q+ A) j7 z/ q0 N+ N4 `5 X8 |3. 表請求: can/could, will/would
( \! d/ X2 e! H( l9 q  D) J2 WCan you take a message? 可以幫我留言嗎?
; A; Y. b" ^7 J& X( ^6 \% ]Will you take a message?
- Z& f2 W/ s6 p0 O$ i, }* ?! X! W較禮貌的說法
Could you take a message?
; Z/ @4 `: {. c  Z8 HWould you take a message?
5 p3 _' Z/ `, V+ A* K5 P3 F  T4. 表建議或提議: should, could
+ s, l  j# F, x建議用should
3 s8 n8 H4 E2 `You should visit Taipei 101 on weekdays. 你最好平日去台北101
提議用could
* j( {) q( r# P+ P$ }2 p2 {We could meet at the weekend. 我們可以約週末見面
5. 表可能性: may/might, could
) a0 d: f9 q8 O  d  C2 N; qI may/might be late, so don't wait for me. 我可能晚點到，所以不要等我
(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)
7 ]  z" U) E7 N5 W* m2 j※ 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
/ ~+ r; v& ~& Z- M# l! K6. 表必須: must
You must follow the regulations. 你必須遵守規則
3 t3 X. a5 K; s# \! O3 ^

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