English verb conjugation COULD WHITEN

Regular verb: whiten - whitened - whitened

Affirmation

Simple form

I could whiten
you could whiten
she could whiten
we could whiten
you could whiten
they could whiten

V-ing form

I could be whitening
you could be whitening
she could be whitening
we could be whitening
you could be whitening
they could be whitening

Perfect

I could have whitened
you could have whitened
she could have whitened
we could have whitened
you could have whitened
they could have whitened

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I whiten?
could you whiten?
could she whiten?
could we whiten?
could you whiten?
could they whiten?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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