Утвердительные

I + am + V ing

you, we, they + are + V ing

she, he, it + is + V ing

I am doing homework

We are going to school

He is eating food

Отрицаиельные

I + am not + V ing

you, we, they + are not + V ing

she, he, it + is not + V ing

I am not doing homework

We are not going to school

He is not eating food

Вопросительные

Am + I + V ing

Are + you, we, they + V ing

Is + he, she it + V ing

Am I going to school?

Are you doing the homework?

Is he eating food?

Также можно сокращать:

I am - I'm

He is - He's

It is - It's

You are - you're

They are - they're