1 is running
thì HTTD : s + be + V-ing
2 buys
thì HTĐ : s + vs/es
dấu hiệu : often
3 isn't drinking
thì HTTD : s + be + V-ing
dấu hiệu : at the moment
4 are climbing
thì HTTD : s + be + V-ing
dấu hiệu : look !
5 is crying
thì HTTD : s + be + V-ing
dấu hiệu : now
6 eat
thì HTĐ : s + vs/es
dấu hiệu : never
7 sets off
thì HTĐ : s + vs/es
dấu hiệu : every fifteen minutes
8 aren't going
thì HTTD : s + be + V-ing
dấu hiệu : tonight