lag ah 

cho câu hỏi hợp lý vào 

ko sai 

thui tui bỏ cuộc :)) died ruif aj 

bỏ cuộc 

ok ok 

em xl em chiuj

Exercise 1. Put the verbs in brackets : present perfect or present perfect progressive. 

1. How long (you / know)............................. Gerry ?

2. You look dirty. What (you / do)..........all day ?

3. How many times (Charles / visit) ............. New York ?

4. The children (watch)................... videos for two hours .

5. (He / study)................... hardn today ?

6. Sorry , I'm late. (You / wait )................... for long ?

7. We (not / see) ...................... Lisa recently . 

8 . How long (he / wait) .......................... for her ?