3. Put the verbs in brackets into the Present Continuous, Past Simple,
Present Perfect or Future Simple Tense.
1) Den __________ (to finish) his homework already. 2) Sally ___________
(to take) this book from the library two days ago. 3) Robots ______________
(to cook) food for people in a hundred years. 4) Boys ____________ (to play)
football in the schoolyard now.