use preset simple , contunuous, perfect or persect continuous
1  I_________(to read ) a very  interesting book now
2  Raing  seldom_____________(to fall) in the sahara
3 I (to be) ___________to the doctor twice this week
4  Jane(to tesch)___________at this university  since
5  What ______you(to do)_____________for the last 45 minutes?
6 We (to have)____________________this cat for the 3 yars
7 Jack  ______you (to listen)_____to what i am saying
8  The film (to star)________at 9 tonight
9  Look.Their plane(to land)___________
10 I(not/to understand)_________________what you are staying