1. Sonia must practise so much if she wants to take part in the marathon.
2. If you want to improve your English, you must work very hard.
3. You need not come to help them tomorrow: the work is done.
4. You need not change the whole text as the beginning is all right
5. John need not tell us the rules of the game: we know them
6. We can not afford to pay the bill. hurry if we don't want to be late.
7. It is already six o'clock. We must/can decorate a room nicely.
8. She can/must take care of your parents
9. You can stay with my brother when we are in Paris
10. 10. We can stay with my brother when we are in Paris
Nowadays, books are not as popular as they used to be,because now people have e-books,which are more convenient and easier to carry.Some print books are really heavy and if you go on a trip, for example, it is much easier to take your e-book with you, than a lot of books.But, for some people, print books are irreplaceable, because they love going to the library or a book shop, they like the smell of an old book and the feeling of holding it in their hands.
Therefore, books and e-books are useful and captivating in its own way.Even if as the time passes, print books become less popular, there will always be people who prefer touching the pages of a print book, than an e-book with hundreds of books in it.
