4. 4) There is a boy on the bicycle.
5) I know a boy with black hair.
6) The boys are young man.
7) I have a telivision.
8) This is a key.
9) This is a key to my car.
5. 1) Mathematics are very dificult.
2) Our football team are winners.
3) The are many birds in the trea.
4) The dishes are on the table.
5) My teeth are white
6) How many boys and girls are there in your class?
7) Are my shirts washed yet?
8) Noy many cities are as big as Moscow.
9) There are six libraries in our school.
Wish I helped you :))