時制問題（451〜475）

No.	問題	選択肢	答えと解説
451	They ___ dinner when we arrived.	A. had B. have C. were having D. had had	解答と解説答え：C. were having 到着時に行動中 → 過去進行形。
452	By next week, she ___ the project.	A. completes B. completed C. will complete D. will have completed	解答と解説答え：D. will have completed 未来のある時点までの完了 → 未来完了。
453	I ___ tennis since I was five.	A. played B. play C. have played D. had played	解答と解説答え：C. have played 過去から現在までの継続 → 現在完了。
454	She ___ already left when I got there.	A. has B. was C. had D. is	解答と解説答え：C. had 到着した時にはすでに → 過去完了。
455	We ___ him last year.	A. met B. have met C. had met D. meet	解答と解説答え：A. met 「last year」→ 過去形。
456	They ___ here since March.	A. are B. were C. have been D. had been	解答と解説答え：C. have been 現在まで継続 → 現在完了。
457	I ___ when she called.	A. am studying B. studied C. was studying D. had studied	解答と解説答え：C. was studying 過去のある時点で行動中 → 過去進行形。
458	He ___ his homework by the time I came.	A. finishes B. has finished C. had finished D. was finishing	解答と解説答え：C. had finished 〜までに完了 → 過去完了。
459	We ___ lunch when the bell rang.	A. had B. were having C. have had D. had had	解答と解説答え：B. were having 過去の途中 → 過去進行形。
460	She ___ to Europe twice.	A. has been B. was C. is D. had been	解答と解説答え：A. has been 経験 → 現在完了。
461	By then, he ___ asleep.	A. falls B. fell C. had fallen D. has fallen	解答と解説答え：C. had fallen ある時点より前 → 過去完了。
462	I ___ to call you yesterday.	A. forget B. forgot C. had forgotten D. was forgetting	解答と解説答え：B. forgot 単純な過去 → 過去形。
463	They ___ for hours when we arrived.	A. talk B. had talked C. had been talking D. were talking	解答と解説答え：C. had been talking 過去のある時点までの継続 → 過去完了進行形。
464	She ___ in the library now.	A. studies B. is studying C. has studied D. was studying	解答と解説答え：B. is studying 現在進行中 → 現在進行形。
465	We ___ together since we met.	A. lived B. live C. have lived D. had lived	解答と解説答え：C. have lived 〜以来ずっと → 現在完了。
466	He ___ TV all day yesterday.	A. watches B. was watching C. watched D. had watched	解答と解説答え：C. watched 一日中の過去の行動 → 過去形。
467	I ___ my keys. Can you help me find them?	A. lose B. have lost C. lost D. had lost	解答と解説答え：B. have lost 現在の影響 → 現在完了。
468	They ___ to Paris next week.	A. will go B. go C. went D. have gone	解答と解説答え：A. will go 未来予定 → 未来形。
469	We ___ dinner by the time she arrives.	A. will have B. have had C. will have had D. had	解答と解説答え：C. will have had 未来完了の構文。
470	He ___ before the meeting started.	A. leaves B. had left C. left D. has left	解答と解説答え：B. had left 開始前にすでに → 過去完了。
471	She ___ breakfast yet.	A. doesn’t eat B. didn’t eat C. hasn’t eaten D. hadn’t eaten	解答と解説答え：C. hasn’t eaten 「yet」と現在への影響 → 現在完了の否定。
472	I ___ him for ten years before we met again.	A. didn’t see B. haven’t seen C. hadn’t seen D. don’t see	解答と解説答え：C. hadn’t seen 再会までの空白期間 → 過去完了。
473	They ___ soccer every Saturday.	A. play B. played C. have played D. had played	解答と解説答え：A. play 習慣 → 現在形。
474	He ___ asleep on the sofa.	A. falls B. has fallen C. fell D. is falling	解答と解説答え：C. fell 過去の出来事 → 過去形。
475	By the end of the year, I ___ this book.	A. finish B. finished C. will have finished D. have finished	解答と解説答え：C. will have finished 〜までに完了 → 未来完了。