1 have studied
3think - is knocking
6 usually rains
7 have been
8 have made
9 owes
10 am - have forgotten
11 is sitting (Tham khảo c11)
12 have had
13 is looking
14 comes
15 have heard
16 have lived
17 study
18 has had
19 need
21 has lived
23 has been
24 has done
25 have been
26 work
27 have written
28 generally gets
29 have made
30 am reading
31 has had