English verb conjugation COULD PUFF

Regular verb: puff - puffed - puffed

Affirmation

Simple form

I could puff
you could puff
he could puff
we could puff
you could puff
they could puff

V-ing form

I could be puffing
you could be puffing
he could be puffing
we could be puffing
you could be puffing
they could be puffing

Perfect

I could have puffed
you could have puffed
he could have puffed
we could have puffed
you could have puffed
they could have puffed

V-ing perfect

I could have been puffing
you could have been puffing
he could have been puffing
we could have been puffing
you could have been puffing
they could have been puffing

Negation

Simple form

I couldn't puff
you couldn't puff
he couldn't puff
we couldn't puff
you couldn't puff
they couldn't puff

V-ing form

I couldn't be puffing
you couldn't be puffing
he couldn't be puffing
we couldn't be puffing
you couldn't be puffing
they couldn't be puffing

Perfect

I couldn't have puffed
you couldn't have puffed
he couldn't have puffed
we couldn't have puffed
you couldn't have puffed
they couldn't have puffed

V-ing perfect

I couldn't have been puffing
you couldn't have been puffing
he couldn't have been puffing
we couldn't have been puffing
you couldn't have been puffing
they couldn't have been puffing

Interrogative form

Simple form

could I puff?
could you puff?
could he puff?
could we puff?
could you puff?
could they puff?

V-ing form

could I be puffing?
could you be puffing?
could he be puffing?
could we be puffing?
could you be puffing?
could they be puffing?

Perfect

could I have puffed?
could you have puffed?
could he have puffed?
could we have puffed?
could you have puffed?
could they have puffed?

V-ing perfect

could I have been puffing?
could you have been puffing?
could he have been puffing?
could we have been puffing?
could you have been puffing?
could they have been puffing?

Interro-negative form

Simple form

couldn't I puff?
couldn't you puff?
couldn't he puff?
couldn't we puff?
couldn't you puff?
couldn't they puff?

V-ing form

couldn't I be puffing?
couldn't you be puffing?
couldn't he be puffing?
couldn't we be puffing?
couldn't you be puffing?
couldn't they be puffing?

Perfect

couldn't I have puffed?
couldn't you have puffed?
couldn't he have puffed?
couldn't we have puffed?
couldn't you have puffed?
couldn't they have puffed?

V-ing perfect

couldn't I have been puffing?
couldn't you have been puffing?
couldn't he have been puffing?
couldn't we have been puffing?
couldn't you have been puffing?
couldn't they have been puffing?

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