May I sit here?
我可以坐在这里吗?
Is anyone sitting here?
这个座位有人吗?
Excuse me,I'm afraid this is my seat.
对不起,恐怕这是我的座位。
May I have your seat?
我可以坐在你的座位上吗?
Would you mind moving your things?
您能把东西移一下吗?