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Present Perfect und Past (Subject) / Unit 12 When? how long? (Lesson)
- Compare when ... ? (+past simple) and how long ... ? (+present perfect): When did it start raining?s: lt started ra ining an hour ago / at 1 o'clock.A: How Long has it been raining?s: lt's been raining for an hour I since 1 o'clock.A: When did joe and Carol first meet?s: Tey lrst met when they were at school./a Long time ago.A: How long have they known each other?for a Long time.s: They've known each other . sincece they were at school /for a Long time. .