Определите время
Present Tenses: Present Simple, Present Progressive, Present Perfect or Present Perfect Progressive.
1.Burning certain fuels (produce) sulphur dioxide.This (mix) with rainwater and ( cause) acid rain.
2.If the population growth (not, slow) down, pollution will increase.
3.The reality (be) that we all (use) up the world's resources-and simple lifestyle changes (can) (help) preserve the planet for future generations.
4."You (switch) off the light, dear?" she asked when we were leaving the house.
5. I (have) this bag for a year already.
6. How long you (use) your bike?
7. Some countries (not, sign) the Kyoto Protocol yet and ( refuse) to cnhange the national way of life.
8. You (have) separate rubbish bins for paper, glass and aluminium in your locality?
9. Look, it ( snow) heavily.It (snow) like that since morning.
10.At the moment many more people (drive) cars dangerously and carelessly.