Can/could - be able to can/is able to
ability in the present.
He can/is able to speak Spanish fluently.
opportunity to do something.
We can sit outside if you like.
could/was able to
ability in the past.
Ile could/was able to speak Spanish when he was ten.
ability in a specific situation in the past.
She was able to solve the puzzle in five minutes.
(NOT: she could...) (=She managed to)
Note: in questions and negations we can use either could or was able to.
will be able to
ability in the future.
He will be able to buy a new car as soon as he gets the money.​

Previously, our ancestors measured time in different ways, for example: water clock, oil clock, sundial, obelisk. The first who knew that the day 24 hours were ancient Egyptians. They distinguished two parts in the day - dark and light time.

The first mechanical watches with a liquid escapement were made in Tang China in 725 AD by Yixing and Liang Lingzan. Then, every year, century, the clock became simpler and clearer. Nowadays there are electronic, radio frequency mechanical clocks. The most practical watch is an electronic one from such a watch you can even call to measure it, etc. The watch nowadays not only fulfills its function, but also people often use it as an accessory.

I believe that the clock has changed dramatically in its development.

1. Will you come to me next Sunday?
2. Will you read this book next week?
3. Do you read books every day?
4. Are you reading a book now?
5. I won't see him tomorrow.
6. What will you do tomorrow?
7. What will you friend do tomorrow?
8. Where will you go next summer?
9. Where do you go every morning?
10. Where are you going now?
11. Look! Mary is dancing.
12. She dances every day.
13. Will she dance tomorrow?
14. He will go to the theatre tomorrow.
15. We go to school in the morning.
16. Look! Kate is going to school.
17. Will you help your mother tomorrow?
18. I'm not palying the guitar now.
19. My brother plays the guitar every evening.
20. They won't take care of the garder next summer.
21. Do you like apples?
22. Will you eat apples tomorrow?
23. Nick reads a lot of books.
24. Mother works every day.
25. He is not sleeping now.
26. Will your brother go to the exhibition next Sunday?
27. We won't go to the Zoo tomorrow.
28. I'm not learning the poem now.
29. She lives in San Francisco.
30. My father shoots very well.
31. He is very strong. Look! He is carrying a very heavy box.