1. Book Three

2. Present tense forms of be: am, is, are
Tenses (I)
Present tense forms of be: am, is, are
Which city is more interesting?
I am a tour guide now.
The students of Class 3 aren’t in the classroom.
School is over.

3. Present tense forms of do: do, does
I live in Hong Kong. I don’t live in Beijing. Do you live in Hong Kong?
Which city do you think is more interesting?
The Great Wall has a history of over twenty centuries.
The Great Wall doesn‘t have a history of over fifty centuries.
Does the Great Wall have a history of over twenty centuries?

4. Present continuous tense: be doing
I am studying art.
He is planning a trip to Mexico.
We are thinking of going to the Great Wall.