Chia động từ trong ngoặc: I see that Tom (write) ... his composition. He says that he (look) ... for a job next week

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