Make these sentences negative and interrogative.
1. We greatly appreciate your contribution into the course.
2. The preposition to is often used in the meaning of direction.
3. The style of handwriting speaks much of a person.
4. I tried to memorize the whole story, but it was very hard.
5. Maybe I will return earlier than usual.
6. Last year I took American English course.
7. She was born in 1999.
8. There are not so many native speakers in the group.
9. We enjoy reading the greatest works by Alexander Pushkin.
10. She will definitely like the novels by Theodor Dreiser.