English verb conjugation COULD EXTINGUISH

Regular verb: extinguish - extinguished - extinguished

Affirmation

Simple form

I could extinguish
you could extinguish
he could extinguish
we could extinguish
you could extinguish
they could extinguish

V-ing form

I could be extinguishing
you could be extinguishing
he could be extinguishing
we could be extinguishing
you could be extinguishing
they could be extinguishing

Perfect

I could have extinguished
you could have extinguished
he could have extinguished
we could have extinguished
you could have extinguished
they could have extinguished

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I extinguish?
could you extinguish?
could he extinguish?
could we extinguish?
could you extinguish?
could they extinguish?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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