1. The sun rises in the east and sets in the west.  

2. Although the sun is rising I cannot see it because it is behind the clouds.  

3. Do you play the piano? - No, I don't.

4. I hear somebody playing in the next room; who is playing there?  

5. It is pleasant to be at home when a storm rages outside.  

6. There are so many people there; where are they all going?  

7. As a rule I feel rather tired after my walk.  

8. Thank you, now I am feeling much better.  

9. He swims very fast.  

10. Look! Somebody is swimming over there.  

11. Where is Alec? - He is in the garden. I think he is doing his morning exercises.  

12. He always does his morning exercises with the window open.  

13. I'd like to see Professor Smith. - Sorry. He is out at the moment. He is giving a lecture.  

14. Sometimes he gives his lectures in English for the students of the English department.