№3
1)is being learnt 2)was exhibited 3)will be bought 4)is cleaned
№4
1) She said that she had bought this cassette that week
2)Bill asked if David's sister had already arrived
3)Ammy asked if the little Anne was crying
4)He told us that we shouldn't ( mustn't) play here
5)Mother said that little Johnny slept every day
6)i assked if he comes to us tomorrow
7)Dennis asked if Mike had written his article
8)Cristy said that she had visited the USA 2 years ago