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Exercise 3. Use the correct form of the verb to be.
1. What... you looking for? - I... trying to find a present for my mother.
2. Where... you going? - I... going to the supermarket.
3. We... driving too fast and didn't see the traffic lights. 4. We... going to be late. The shop will be closed.
5. My Sister...choosing an umbrella too long but didn't buy any.
6. ...you going to the baker's? Buy a loaf of bread for me, please.
7. While his mother ...paying for the things, he bought a bar of chocolate for himself. 8. His friend … celebrating her birthday tomorrow. Let's go and buy her some present.
9. I hope it... not... raining on Sunday. We … going to the country.
10. Her daughter … thinking about the dress she saw in the shop window yesterday.
11. We … playing chess in half an hour.
12. Mary... trying to improve her English.
13. It was beautiful yesterday when we went out for a walk, it … not raining, the sun... shining.​