English verb conjugation COULD REFINE

Regular verb: refine - refined - refined

Affirmation

Simple form

I could refine
you could refine
he could refine
we could refine
you could refine
they could refine

V-ing form

I could be refining
you could be refining
he could be refining
we could be refining
you could be refining
they could be refining

Perfect

I could have refined
you could have refined
he could have refined
we could have refined
you could have refined
they could have refined

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I refine?
could you refine?
could he refine?
could we refine?
could you refine?
could they refine?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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