一般现在时：
I like reading.
I go to school at 8:00am.
He is a student.
He enjoys his lunch.
She is a girl.
She likes green.
Her mother is a nurse.
His father drives a white car.
We are able to speak English.
Now it is 2:00 pm.
His head is above the water.
过去进行时：
I was riding my bike when I saw her.
She was playing the piano when I came in the room.
He was doing his homework.
They were having a football match.
I was listening to music when you called me.
They were asking a girl to go away.
They were having their dinner.
I was reading a book while you were watching TV.
The teacher was talking about the history of China when I left.
The bus driver was cleaning the bus.