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Auxiliary verbs 

 DO,  BE,   HAVE 

The auxiliary verbs  DO, BE, and HAVE carry different meaning from the main verbs DO, BE, and HAVE. The auxiliaries cannot form non-finite verb phrases, known as infinitives or gerunds. Additionally, they function to indicate the person and tense of the finite verb phrase. Modals also act as auxiliaries, but modals do not indicate person or tense.   

Learning the Auxiliaries

Auxiliary verbs show the person and the tense of the finite verb phrase. Auxiliary verbs are found in every clause. The worlds of business and academics require the use of he Standard English rules of auxiliary verbs..         

Click the picture to play The Missing Auxiliary


simple tenses


 continuous tenses


perfect aspect




shall  eat

will eat

can eat

should  eat

might  eat

would eat

could eat

must eat

may eat





I do eat

you do eat

he, she, it does eat

we do eat

you do eat

they do eat


I am eating

you are eating

he, she, it is eating

we are eating

you are eating

they are eating


I have eaten

you have eaten

he, she, it has eaten

we have eaten

you have eaten

they have eaten



I did eat

you did eat

he, she, it, did eat

we did eat

you did eat

they did eat


I was eating

you were eating

he, she, it was eating

we were eating

you were eating

they were eating


I had eaten

you had eaten

he, she, it had eaten

we had eaten

you had eaten

they had eaten