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 could not puff
you could not puff
he could not puff
we could not puff
you could not puff
they could not puff

V-ing form

I could not be puffing
you could not be puffing
he could not be puffing
we could not be puffing
you could not be puffing
they could not be puffing

Perfect

I could not have puffed
you could not have puffed
he could not have puffed
we could not have puffed
you could not have puffed
they could not have puffed

V-ing perfect

I could not have been puffing
you could not have been puffing
he could not have been puffing
we could not have been puffing
you could not have been puffing
they could not 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

could I not puff?
could you not puff?
could he not puff?
could we not puff?
could you not puff?
could they not puff?

V-ing form

could I not be puffing?
could you not be puffing?
could he not be puffing?
could we not be puffing?
could you not be puffing?
could they not be puffing?

Perfect

could I not have puffed?
could you not have puffed?
could he not have puffed?
could we not have puffed?
could you not have puffed?
could they not have puffed?

V-ing perfect

could I not have been puffing?
could you not have been puffing?
could he not have been puffing?
could we not have been puffing?
could you not have been puffing?
could they not have been puffing?

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