1. VERB TENSES REVISION
Fill in the gaps with the verbs in the Simple Past, Past Perfect, Present
Perfect, Present Perfect Continuous and the Gerund
1. Last week I ____________(visit) my grandmother and I ________ (teach) her how
to recycle packaging.
2. Lionel ___________(work) for this environmental organization since 1983. Now he
is the director.
3. We _________ (already/watch) An Inconvenient Truth, by Al Gore. We liked it a
lot.
4. Yesterday I _______ (buy) some energy-saving light bulbs to replace the ones I
have now.
5. My parents believe that it is a waste of time ____________(separate) the rubbish.
6. I __________ (recycle) packaging and glass ever since I was a child.
7. It’s worth __________ (try) to fight against all types of air pollution.
8. Al Gore __________ (do) lots of research before he started presenting the facts
on global warming.
9. In China there’s great difficulty in __________ (control) the carbon dioxide
emissions caused by cars.
10. It’s a fact that there are a lot of things that I ________ (do) wrong so far and I
_____________ (never/think) that I could do something for our planet.