Helping verbs that do not change form.
|can||I can go.||I am able to go.|
|could||I could go.||I have permission to go.|
|may||I may go.||It is possible that I will go.|
|might||I might go.||I could go but probably will not.|
|must||I must go.||I will go because I do not have a choice.|
|shall||I shall go.||It is inevitable that I will go.|
|should||I should go.||I should go but don’t want to.|
|will||I will go.||It is certain that I will go.|
|would||I would go.||I would go if I could, but I cannot.|
These helping verbs do not change form with person or time. For example: I might go. He might go. You might go. We might go. They might go.
Helping verbs that change form.
|Verb||Regular forms||Negative forms|
|TO DO||do, does, did||don’t, doesn’t, didn’t|
|TO HAVE||have, has, had||haven’t, hasn’t, hadn’t|
|TO BE||be, am, is, are, was, were, being, been||isn’t, aren’t, wasn’t, weren’t|
These helping verbs change form with person and time. For example: I do go. He does go. You do go. I did go. We did go. They did go. I have gone. He has gone. We have gone. I had gone. She had gone. We had gone.