7-11/ When + 単純過去形？　How long + 現在完了形？

① A: When did it start raining?
B: It started raining an hour ago. / at 1:00.

② A: How long has it been raining?
B: It’s been raining for an hour. /since 1:00.

① A: When did Jay and Meg first meet?
B: They first met a long time ago./ when they were in high school.

② A: How long have they known each other?
B: They’ve known each other for a long time./ since they were in high school.

① When did you last see Olivia?
② How long has it been since you saw Olivia?

① When did Mrs. Taylor die?
② How long has it been since Mrs. Taylor died?

① It’s been two years since I saw Noah.
② I haven’t seen Noah for two years.

① It’s been ages since we went to the movies.
② We haven’t gone to the movies for ages.