Each of the following sentences has one mistake. Identify and correct the mistakes: Ba often does his homeworks in the evening

Each of the following sentences has one mistake. Identify and correct the mistakes.
1. Ba often does his homeworks in the evening.
2. They aren't go to bed at 9 o'clock.
3. That's my sister over there. She stands near the window.
4. Her garden is big. It's a garden big.
5. He's wairtng to the bus at the moment.