81. I see that Tom ( write )....is writing..... his composition.
82. He says that he ( look ) ...will look...........for a job next week.
83. They think he ( be ) .....was...... here last night.
84. He tells us that he ( be ) ....has been...... to the mountains before .
85. He wants to do it before his father ( come ).....comes...........
86. The student who answered the question ( be )....is......... John.
87. This is the house that Jack ( build ).....built.......... 3 years ago.
88. Mary ( have ).....was having.......... dinner when her friend called.
89. I'll wait until he ( finish ) .......finishes........his novel .
90. When you ( come ) .......come......back , he ...willl..already ( buy ).....buy........ a new house.