76.My teacher (come)......here if he (have)..........time.
77.The trees (grow).................very fast at the moment.
78.David seldom (sing)..................an English song.
79.I (help)................you if I (be)..............free.
80.Peter (borrow)..................your CDs tonight.
81.If she (ask)...........me, I (not/answer)...............her.
82.My mother often(tell)...........stories at night.
83.They (travel)............to Canada twice a year.
84.I (talk)................with him if he (phone)...............me.
85.He (stay).............up very late last night.
86.He (learn)...................French tonight.
87.Mr. Pike and Mr. Brown (leave).......................here next month.
giúp vs ạ