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.