chia động từ:
1/ when i (come) (see) them, they (play) chess
2/ she always (thank ) foe me what i (do) for her
3/ he (write) the novel for the last two years but he (not finish ) it yet
4/ this is the third time you (be) here. what exactly (you/come) for now?
5/ Rich (have) his hair cut when John (call)
6/ mary (be) in Japan for 2 years. She (work) there and (like) it very much