Basic American English Grammar - Lesson 6 ( Do - Present Tense )

I do We do
You do You do
He does
She does They do
It does

EXAMPLES 

I do the homework every weekend. 
but it is  used to make the present tense & the past tense negative: 

I don't have any dollars. 

He didn't go to the market yesterday. 

It is also used when making questions: 

Do you know what is the time ? 

Does he have a motorcycle?