Where is canteen/teacher's office ...？
It's on the first/second ... floor.
This is 表示这是，用来表达近处；
That is 表示那是，用来表达远处。
当要询问你想要找的地点时，应该说:
Where is the art room/gym... ?
Is this / that the art room/gym ...？
What time is it? It's seven/nine/ten ...o'clock.
当你想要谈每天几点都要干什么时，应该说:
It's time to go to school/go to bed ... .
It's time for breakfast/dinner... .
当要问是不是别人的东西的时候,你应该说
Is this your T-shirt/jacket ...?
Yes, it is. Thank you.
Is that your dress/sweater ...?
No, it's not.