助動詞問題（251〜275）

No.	問題	選択肢	答えと解説
251	You ___ try restarting your computer.	A. might B. must C. should D. would	解答と解説答え：C. should 助言や提案の表現。
252	I ___ not go if it rains tomorrow.	A. shall B. will C. may D. must	解答と解説答え：B. will 未来の意思・予定。
253	He ___ have been working late.	A. could B. might C. must D. can	解答と解説答え：C. must 現在完了形と組み合わせた強い推量。
254	___ you open the window, please?	A. Should B. Could C. Would D. Might	解答と解説答え：B. Could 丁寧な依頼。
255	He ___ not have lied to you.	A. should B. must C. can D. would	解答と解説答え：B. must 強い確信をもった否定（推量）。
256	You ___ take a break now.	A. must B. can C. might D. should	解答と解説答え：B. can 許可の表現。
257	She ___ be very busy today.	A. should B. must C. could D. might	解答と解説答え：B. must 状況からの強い推量。
258	I ___ have helped you if I had known.	A. would B. should C. could D. might	解答と解説答え：C. could 仮定法過去完了：過去の可能性。
259	We ___ not be able to attend the meeting.	A. might B. will C. should D. must	解答と解説答え：A. might 未来に対する不確かな可能性。
260	He ___ have left already.	A. can B. could C. should D. must	解答と解説答え：D. must 確信に基づく現在完了の推量。
261	They ___ want to reconsider their decision.	A. may B. can C. would D. must	解答と解説答え：A. may 可能性の表現。
262	You ___ not be so rude to the teacher.	A. must B. can C. should D. would	解答と解説答え：C. should 忠告・道徳的な義務。
263	I ___ see the stars clearly from here.	A. could B. might C. should D. must	解答と解説答え：A. could 視覚的な能力。
264	___ we go out for dinner tonight?	A. Shall B. May C. Must D. Will	解答と解説答え：A. Shall 提案・提議。
265	You ___ not have eaten that.	A. must B. should C. might D. could	解答と解説答え：B. should 非難や後悔の意図。
266	We ___ wait here until the rain stops.	A. can B. must C. may D. will	解答と解説答え：B. must 義務的な表現。
267	She ___ have gone to the wrong station.	A. must B. should C. could D. would	解答と解説答え：C. could 過去の可能性。
268	I ___ help you if you need it.	A. will B. shall C. may D. would	解答と解説答え：A. will 意志を示す未来の約束。
269	They ___ not know the whole story.	A. can B. must C. might D. should	解答と解説答え：C. might 可能性の否定。
270	He ___ always be late to meetings.	A. might B. would C. could D. can	解答と解説答え：B. would 過去の習慣の表現。
271	You ___ have seen him yesterday.	A. might B. must C. could D. should	解答と解説答え：C. could 過去の推量・可能性。
272	I ___ not have agreed if I had known.	A. might B. would C. could D. must	解答と解説答え：B. would 仮定法過去完了。
273	She ___ not come with us today.	A. can B. might C. must D. should	解答と解説答え：B. might 不確かな可能性。
274	We ___ finish the project by Friday.	A. shall B. must C. can D. would	解答と解説答え：B. must 期限への義務。
275	You ___ be joking!	A. must B. will C. should D. might	解答と解説答え：A. must 冗談だろうという確信的な推量。