Present perfect continuous tense 1.the stewardess(to serve) lunch for half an hour 2.lolly(to watch)tv since 2 o'clock? 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?

The stewardess has been serving lunch for half an hour
2.Has Lolly been watchingTV since 2 o'clock?
3.What game have Andy and his friends been playing at the school sports ground for three hours?
4.How long have you been waiting for your friend to go to the theatre?
5.What languages has your sister been learning since she was seven? 
6.Has Roy been collected post-cards for ten years?
7.How long has your family been living in St.Petersburg?
8.have You been going in for swimming for two years?

1)has been serving
2)has been watching
3)have been playing
4)have been waiting
5)has been learning
6)has been collecting
7)has been living
8)have been going