1)There were not any children in the hall.
2)Are there any copybooks in the bookcase?
3)Was there a desk in the classroom yesterday?
4)There will be a football match at stadium tomorrow.
5)There were some students at the lecture last week.
6)There is a cafe in this street.
7)There will be a party on the square next Monday.
8)Were there many discoveries last century?
9)There were not any enterprises in the area year ago
10)There will not be any pits here.
11)There is not poor settlement in that museum.
12)There is a cap on the floor.
13)Is there any water in the glass?
14)There are not any pencils in the pencil-box.
15)There is something on the shelf.
Mobile phones can be useful for a number of reasons. Firstly, the allow us to communicate quickly in almost any situation. This can be really useful in emergencies, for example. Furthermore, they make it easy for people who are alone to be in contact with others. Finally, they are useful for other things, not just for making calls. For example, we can use them to listen to music, play games and take photos.
But on the other hand people depend on them too much and make calls which are not really necessary.
To sum up, mobile phones have advantages but, on the other hand, they can also create problems. In my opinion life would be worse without them because they always make our lives easier.