1 has just seen ( dấu hiệu : just)
2 has already finished ( dấu hiệu: already)
3 has read ( dấu hiệu: three times)
4 have been studying ( dấu hiệu: since)
5 has been living ( dấu hiệu: for)
6 have been studying ( dấu hiệu: for)
7 have you waited ( dấu hiệu: how lòng)
8:haven't seen ( dấu hiệu: yet)
9 Have you ever been , have been
10 has been
Nocopy
@gladbach
