Verb to be (Present Tense - Question) - 02

Change the following sentences to questions. Don't forget the question mark!
Example, change "You are seven years old" to "Are you seven years old?"

1. The boys are playing in the playground.
2. My dogs are brown.
3. My orange juice is sour.
4. The boys are in the swimming pool.
5. My mother is in the kitchen.
6. I am a good student.
7. You are a handsome boy.
8. My English teacher is American.
9. The books are on the shelf.
10. It is a blue pen.