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
can表示現在及未來的能力, could 表示過去的能力
1 D! C- ]! b" h$ T2 i  G8 A  AShe 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
2. 表允許: can/could, may
* b, w  w* n9 `$ {2 Y尋求對方允許
8 g+ l: w2 y* }1 G% eCan I borrow your car? 我可以借你的車嗎?
5 v6 @, ]' O9 k; x- F! k# GCould I borrow your car? (較禮貌)
1 G+ E( Y0 y7 a/ L2 f% uMay 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
( S) E' p  p/ C1 y# [! `You may stay at my place if you like. (較正式)
) k% p5 a5 V8 Y. d  L- Q有權利(被允許)做某事
8 d4 v+ Z* o) C, }/ @3 a5 x; rStudents can buy discount tickets. 學生可以買優惠票
Students may buy discount tickets. (較正式)
6 z/ A6 M" F0 T5 B6 Z; x* _5 x( m3. 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?
4. 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
1 q; I8 s& G5 q; h  D. h% Z提議用could
We could meet at the weekend. 我們可以約週末見面
5. 表可能性: may/might, could
0 x2 v$ [4 Z3 s$ FI may/might be late, so don't wait for me. 我可能晚點到，所以不要等我
" V. C/ e% O% F5 [9 {2 o& ]* l(may=might, 用法及意思沒有差異)
3 Y, B9 Z- s# @- }9 LMost 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)
6 t2 t, X% C) Y3 ~9 n※ 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 I, D8 @! ]- l6. 表必須: must
, l* y! z3 c  r9 nYou must follow the regulations. 你必須遵守規則

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