English verb conjugation COULD HOWL

Regular verb: howl - howled - howled

Affirmation

Simple form

I could howl
you could howl
he could howl
we could howl
you could howl
they could howl

V-ing form

I could be howling
you could be howling
he could be howling
we could be howling
you could be howling
they could be howling

Perfect

I could have howled
you could have howled
he could have howled
we could have howled
you could have howled
they could have howled

V-ing perfect

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

Negation

Simple form

I could not howl
you could not howl
he could not howl
we could not howl
you could not howl
they could not howl

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I howl?
could you howl?
could he howl?
could we howl?
could you howl?
could they howl?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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