Present Perfect Continuous Tense 1.The stewardess(to serve) lunch for half an hour 2. ly(to watch)TV since 2 oclock? 3.What game Andy and his friends(to play)at the school sports ground for three hours? 4.How long you (to wait for)your friend to go to the theatre? 5.What languages your sister(to learn) since she was seven? 6.Roy(to collect) post-cards for ten years? 7.How long your family(to live) in St.Petersburg? 8.You (to go) in for swimming for two years?
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