Modals Chart

Modal

Past Modal

Negative

Negative Past

Can

Could

Can't
Cannot

Couldn't
Could not

Could

Could have

Could not

Couldn't have
Could not have

Will

Would

Won't
Will not

Wouldn't
Would not

Would

Would have

Wouldn't
Would not

Wouldn't have
Would not have

May

May have

May not

May not have

Might

Might have

Might not

Might not have

Should

Should have

Should not

Should not have

Must

Had to
Must have

Must not
Mustn't

Must not have

Ought to

Ought to have

Ought not to

Ought not to have

Have to
Has to

Had to

Don't have to
Doesn't have to

Didn't have to
Did not have to

Have got to
Has got to

Be going to
Be supposed to

Was/were

Is/are/am/not going to
Isn't/aren't/am not supposed to

Wasn't/weren't going to
Wasn't/weren't supposed to

Be able to

Was/were able to

Isn't/aren't able to

Wasn't/weren't able to

Be to

Was/were to

Is/are/am/not to

Wasn't/weren't to

Need to
Needs to

Needed to

Doesn't need to

Didn't need to
Needn't

Had better

Had better not

Used to

Didn't use to

Be about to

Was/were about to

Is/are/am not about to

Wasn't/weren't about to

Would rather

Would rather have

Would rather not

Would rather not have