系动词 am is are
He is a student.
I am a teacher.
They are nice.
行为动词 act speak play
He acts as a hero in the war.
She speaks Chinese.
They play football everyday.
助动词 have do am
I have slept for 3 hours.
Do you think you are right?
I am learning English.
情态动词 can may will
Can I help you?
May I have a look at it
Will you go with me?
一般过去时
I got up early.
He said this before.
一般现在时
The earth travels around the sun.
It is delicious.
现在进行时
He is listening to a piece of music.
They are laughing.