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24 was going-went out.25 were watching-came-knocked.26 were you doing-was preparing.27 fell-was watching.28 was seeing.Present perfect simple o continuos. 29 have you been studying.30 has he been working.31 've lost.32 've been reading- haven't finished.33 have you heard-Simon has broken.34 have you written.35 have you been doing-'ve been waiting.36 have been playing.37 have known.38.Has been marking-hasn't read.Present perfect o past perfect.39 had left.40 have made.41 had already started.42 has finally stopped.43 have just had.44 hadn't cleaned.45 had made.46 I have really had.47 had noticed. 48 had heard