助動詞問題（26〜50）

No.	問題	選択肢	答えと解説
26	You ___ see a doctor if you're feeling sick.	A. must B. should C. can D. may	解答と解説答え：B. should 助言としての「～すべき」。
27	I ___ play the piano when I was five.	A. can B. could C. may D. must	解答と解説答え：B. could 過去の能力を表す助動詞。
28	She ___ be at home now; I just saw her downtown.	A. can B. must C. can't D. should	解答と解説答え：C. can't 論理的にあり得ないことを否定する助動詞。
29	You ___ come with us if you want.	A. can B. must C. should D. would	解答と解説答え：A. can 許可の意味の助動詞。
30	He ___ have taken the wrong train.	A. can B. should C. must D. would	解答と解説答え：C. must 過去に関する強い推量 → must have + 過去分詞。
31	___ I open the window?	A. Can B. Would C. Must D. Shall	解答と解説答え：A. Can 許可を求める表現。
32	You ___ smoke here. It’s a non-smoking area.	A. should B. mustn't C. can't D. may not	解答と解説答え：B. mustn't 禁止を表す強い助動詞。
33	If I were you, I ___ apologize.	A. would B. can C. must D. shall	解答と解説答え：A. would 仮定法での助言に使う助動詞。
34	You ___ finish your homework before watching TV.	A. should B. may C. can D. might	解答と解説答え：A. should 助言・当然の意味。
35	He ___ be sleeping now; it’s quite late.	A. must B. will C. can D. shall	解答と解説答え：A. must 現在の強い推量。
36	___ you like some coffee?	A. Would B. Shall C. Can D. Must	解答と解説答え：A. Would 丁寧な申し出。
37	We ___ be late if we don’t leave now.	A. should B. can C. might D. must	解答と解説答え：C. might 未来の可能性。
38	You ___ not tell anyone about this.	A. can B. must C. should D. shall	解答と解説答え：B. must 強い命令・義務。
39	I ___ help you if I had time.	A. can B. would C. may D. shall	解答と解説答え：B. would 仮定法の文構造。
40	She ___ have told the truth.	A. should B. can C. will D. shall	解答と解説答え：A. should 過去の助言・義務。
41	You ___ enter without a pass.	A. can B. mustn't C. shall D. may not	解答と解説答え：D. may not 許可されていない → may not。
42	I ___ answer the phone while driving.	A. must B. shouldn’t C. can D. would	解答と解説答え：B. shouldn't 助言・避けるべき行動。
43	She ___ have forgotten our meeting.	A. must B. should C. may D. might	解答と解説答え：D. might 弱い推量（かもしれない）。
44	We ___ go to the museum this weekend.	A. might B. must C. shall D. can	解答と解説答え：A. might 未来の不確実な予定。
45	You ___ be more careful in the future.	A. shall B. would C. should D. could	解答と解説答え：C. should 助言としての「～すべき」。
46	He ___ be at the party already.	A. must B. may C. can D. should	解答と解説答え：A. must 強い推量。
47	You ___ speak so loudly; people are sleeping.	A. mustn't B. can't C. shouldn't D. wouldn't	解答と解説答え：C. shouldn't 配慮としての助言。
48	She ___ call you when she arrives.	A. might B. will C. can D. should	解答と解説答え：B. will 未来の確実な予定。
49	We ___ leave before the sun sets.	A. shall B. may C. must D. can	解答と解説答え：C. must 強い必要性。
50	___ you help me with this box?	A. Must B. Would C. Shall D. Might	解答と解説答え：B. Would 丁寧な依頼。