Put the verb into correct tense 1. He (to work) in the laboratory now. Don’t bother him. 2. Water
(to boil) at 100 degrees centigrade. 3. Who (to discover) the
electron? 4. Thomas Edison (to invent) the electric lamp. 5. you
(to know) that scientists? 6. they (to invent) this device in 2012?
7. she (to study) at this University? 8. you (to watch) TV
now?