Tìm lỗi sai:

1. My father has tetired 3 years ago and he is now living on his pension.

2. If only we has a bigger house we can invite our friend to stay.

3. It took me many timeto learn this lesson.

4. They listened to their teacher carefully, as they understood the lesson easily.

5. The boy broke the window when he is playing football with his friends.

6. The police ordered the man don't remove his hands from the steering wheel