ex a 2 I've been / 3 did you go / 4 finished / 5 I've been / 6 did you go / 7 went
ex b.1 2 had / 3 did you meet / 4 was / 5 went / 6 've known / 7 got / 8 were you / 9 ´ve just met
ex b.2 1 Have you taught / 2 taught / 3 have just come / 4 have you been / 5 was / 6 started / 7 haven´t finished
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