1. - The government is trying to reduce air pollution, isn't it? - That's right, there are new rules for car usage now.
2. The kids had to collect the garbage, right?
3. Acid rains have been causing serious damage to the forests of Sweden for many years.
4. - You've been building birdhouses since morning, haven't you? - Yes, I want to finish as quickly as possible, join in, will you help?
5. Take gardening gloves, a rake and a watering can and help your father in the garden.