@Thỏ

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

76.will come/has

77.are growing

78.sings

79.would help/were

80.is borrow

81.askes/won't answen

82.tells

83.travel

84.will talk/phones

85.stayed

86.is learning

87.are leave