Formation of Questions with Helping Verbs

Front

Helping verb for questions in present simple tense?

Back

do

Front

Helping verb for past simple questions?

Back

did

Front

Helping verb for questions in present continuous tense?

Back

is

Front

Helping verb for past continuous questions?

Back

were

Front

Helping verb for questions in present perfect tense?

Back

have

Front

Helping verb for past perfect questions?

Back

had

Front

Helping verb for future simple questions?

Back

will

Front

Helping verb for future continuous questions?

Back

will

Front

Helping verb for future perfect questions?

Back

will have

Front

Helping verb for questions in modal construction?

Back

can