Поставьте глаголы в нужную форму.
1) I know you (sing) very well
2) Listen, somebody (sing) in the next room
3) I (read not) this article yet
4) You friend (study) at musik school
5) She often (make) mistakes in English

1) I know you  sing very well.2) Listen, somebody  is singing in the next room.3) I have not read  this article yet.4) Your friend studies at Music School.