English verb conjugation COULD BIRL

Regular verb: birl - birled - birled

Affirmation

Simple form

I could birl
you could birl
he could birl
we could birl
you could birl
they could birl

V-ing form

I could be birling
you could be birling
he could be birling
we could be birling
you could be birling
they could be birling

Perfect

I could have birled
you could have birled
he could have birled
we could have birled
you could have birled
they could have birled

V-ing perfect

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

Negation

Simple form

I could not birl
you could not birl
he could not birl
we could not birl
you could not birl
they could not birl

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I birl?
could you birl?
could he birl?
could we birl?
could you birl?
could they birl?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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