Put the verbs in brackets in the correct form.

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
a. Everything is ready for your lesson. The board (1. clean) and the lights (2. turn on) . All the students (3. wait) for you.
b. If Mary (1. know) anything about car mechanics, I'm sure she (2. help) us fix the car, but I think she (3. know) even less than we do.
c. I (1. decide) (2. stay) at home last night.
I (3. go out) if I (4. not be) so tired.