English verb conjugation COULD WINNOW

Regular verb: winnow - winnowed - winnowed

Affirmation

Simple form

I could winnow
you could winnow
she could winnow
we could winnow
you could winnow
they could winnow

V-ing form

I could be winnowing
you could be winnowing
she could be winnowing
we could be winnowing
you could be winnowing
they could be winnowing

Perfect

I could have winnowed
you could have winnowed
she could have winnowed
we could have winnowed
you could have winnowed
they could have winnowed

V-ing perfect

I could have been winnowing
you could have been winnowing
she could have been winnowing
we could have been winnowing
you could have been winnowing
they could have been winnowing

Negation

Simple form

I couldn't winnow
you couldn't winnow
she couldn't winnow
we couldn't winnow
you couldn't winnow
they couldn't winnow

V-ing form

I couldn't be winnowing
you couldn't be winnowing
she couldn't be winnowing
we couldn't be winnowing
you couldn't be winnowing
they couldn't be winnowing

Perfect

I couldn't have winnowed
you couldn't have winnowed
she couldn't have winnowed
we couldn't have winnowed
you couldn't have winnowed
they couldn't have winnowed

V-ing perfect

I couldn't have been winnowing
you couldn't have been winnowing
she couldn't have been winnowing
we couldn't have been winnowing
you couldn't have been winnowing
they couldn't have been winnowing

Interrogative form

Simple form

could I winnow?
could you winnow?
could she winnow?
could we winnow?
could you winnow?
could they winnow?

V-ing form

could I be winnowing?
could you be winnowing?
could she be winnowing?
could we be winnowing?
could you be winnowing?
could they be winnowing?

Perfect

could I have winnowed?
could you have winnowed?
could she have winnowed?
could we have winnowed?
could you have winnowed?
could they have winnowed?

V-ing perfect

could I have been winnowing?
could you have been winnowing?
could she have been winnowing?
could we have been winnowing?
could you have been winnowing?
could they have been winnowing?

Interro-negative form

Simple form

couldn't I winnow?
couldn't you winnow?
couldn't she winnow?
couldn't we winnow?
couldn't you winnow?
couldn't they winnow?

V-ing form

couldn't I be winnowing?
couldn't you be winnowing?
couldn't she be winnowing?
couldn't we be winnowing?
couldn't you be winnowing?
couldn't they be winnowing?

Perfect

couldn't I have winnowed?
couldn't you have winnowed?
couldn't she have winnowed?
couldn't we have winnowed?
couldn't you have winnowed?
couldn't they have winnowed?

V-ing perfect

couldn't I have been winnowing?
couldn't you have been winnowing?
couldn't she have been winnowing?
couldn't we have been winnowing?
couldn't you have been winnowing?
couldn't they have been winnowing?

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