Ex 3
1 haven’t
seen 2 haven’t heard 3 has failed 4 has made 5 has been worrying 6 has been
studying 7 hasn’t taken
Ex 4
1 are>
have been 2 has been winning > has won 3 OK 4 they have taken the dog … 5 OK
Ex 5
1 My wife
has been painting for five years, but she hasn’t sold a single painting yet.
2 I’m glad
that we have finished the work
3 My hands
are dirty. I have been working in the garden.