The simple form for verbs in English:

helping verbs	simple	past	past participle
	live	lived	lived
	work	worked	worked
	study	studied	studied
do	want	wanted	wanted
does	go	went	gone
did	see	saw	seen
will	do	did	done
can	have	had	had
	eat	ate	eaten

Helping verbs are used with the simple form to make questions:

Do you live in the United States?

Did you go to the store today?

When will we have dinner?

What did you eat for breakfast?

Helping verbs are used with the simple form to make negative statements:

He doesn’t want any brocolli.

She didn’t do her homework.

I can’t see the menu.

We won’t have enough time to finish.

The simple form is also known as “the base form” or “the infinitive.”