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
0 h" J- G3 _" j. S4 t2 zcan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
4 h1 ?7 ^4 j( B7 k+ ~. O! hShe couldn't dance well. 她以前不太會跳舞
( v% }, K; f. A3 r" {2. 表允許: can/could, may
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)
2 q, G3 i- z, ^May I borrow your car? (較正式且禮貌)
) A; O) k1 h) v$ v" [給予許可
' x6 ~: [; S% C1 C* VYou can stay at my place if you like. 如果你想住我家的話，可以喔
You may stay at my place if you like. (較正式)
2 r  C! D; Z" _有權利(被允許)做某事
6 H: e; r( {% G+ q7 n4 w* qStudents can buy discount tickets. 學生可以買優惠票
Students may buy discount tickets. (較正式)
7 y/ s& g* y6 D# {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?
: S8 Y; q2 |3 N% B: {較禮貌的說法
Could you take a message?
Would you take a message?
5 m1 H4 i7 \2 ?7 ^; v. |: Y4. 表建議或提議: should, could
建議用should
* ^6 f, r% R" f/ iYou should visit Taipei 101 on weekdays. 你最好平日去台北101
提議用could
" d5 c- b; g7 g2 qWe could meet at the weekend. 我們可以約週末見面
5. 表可能性: may/might, could
6 F) k% C1 F- x) JI may/might be late, so don't wait for me. 我可能晚點到，所以不要等我
0 f# S2 N1 u- o(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)
% p" z& |! z. c3 P( _8 R※ 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
  u/ m" J1 u, h; {' w" X6. 表必須: must
( a( d" K0 h* X5 L" z5 o% YYou must follow the regulations. 你必須遵守規則
1 R0 W5 l' n- I  k% ^- S

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