Английски язык. Укажите пожалуйста времена, в предложениях
1 By the time Denis went to school, his mother ...(teach) him to read and count.
2 At the age of four, Denis ...(read) "The Adventures of Tom Sawyer'.'
3 Now Denis is only twelve but he ...(pass) his school-leaving exams (выпускные экзамены) in maths, physics and history.
4 He ...(study) English since he was six, but it still needs improving.
5 Denis believes that he ...(enter) university at the age of 14. -
6 Denis boasts (хвастается) that he ...(learn) at least five languages by the lime he is 20.

1 had taught
2 read
3 has passed
4 has been studying
5 will enter
6 will have learnt