13.2
3 went
4 has gone/'s gone
5 have forgotten/'ve forgotten
6 forgot
7 had
8 has been/'s been
9 haven't finished
10 has just gone/'s just gone
11 arrested
12 gave ... lost or have lost/'ve lost
13 was ... has disappeared/'s disappeared
14 have improved/'ve improved
13.3
3 wrong--did Shakespeare write
4 right
5 wrong--was
6 right
7 wrong--My grandparents got married.
8 wrong--were you born
9 right
10 wrong--was the scientist who developed.
