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.