1/ was been
2/ go
3/ do - study - was study
4/ saw
5/ was not meet
6/ are playing
7/ did not finish

1.have been 2.go 3.have/studied/have studied 4.saw 5.haven't met 6.are playing 7.haven't finished
8.was 9.just buy 10.will build 11.hasn't rained 12.liked 13.began/have learning 14.Have/been
15.rang/watched 16.has teached/left 17.is running 18.are having 19.has lived 20.invented 21.is/hasn't go