Воткнуть вместо пропусков модальные глаголы can (could) либо to be able

Вставить заместо пропусков модальные глаголы can (could) либо to be able to
1.We knew that she ______ speak English since childhood.
2.He spoke very quickly, but I ________ understand him
3.He ________ (not) have seen her.
4.I _______(not) solve the problem
5.I finished a computer training course last year and I _______ perform a lot of operations in different programmes.
6.I ________stop my car in time before slamming into next car.
7.She ________ speak Spanish fluently by the end of the year.