English verb conjugation COULD CORROBORATE

Regular verb: corroborate - corroborated - corroborated

Affirmation

Simple form

I could corroborate
you could corroborate
he could corroborate
we could corroborate
you could corroborate
they could corroborate

V-ing form

I could be corroborating
you could be corroborating
he could be corroborating
we could be corroborating
you could be corroborating
they could be corroborating

Perfect

I could have corroborated
you could have corroborated
he could have corroborated
we could have corroborated
you could have corroborated
they could have corroborated

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I corroborate?
could you corroborate?
could he corroborate?
could we corroborate?
could you corroborate?
could they corroborate?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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