Which of these sentences are grammatically incorrect? Correct the mistakes.
1. I’m working here since October.
2. It could cost three million pounds.
3. It depends on the weather.
4. How long have you known Jack?
5. I’m not as tall as Gina.
6. Have you finished your homeworks yet?
7. The waiting room is in the end of the corridor.
- I‘ve been working here since October.
- Have you finished your homework yet?
- The waiting room is at the end of the corridor.