English verb conjugation COULD WEAKEN

Regular verb: weaken - weakened - weakened

Affirmation

Simple form

I could weaken
you could weaken
he could weaken
we could weaken
you could weaken
they could weaken

V-ing form

I could be weakening
you could be weakening
he could be weakening
we could be weakening
you could be weakening
they could be weakening

Perfect

I could have weakened
you could have weakened
he could have weakened
we could have weakened
you could have weakened
they could have weakened

V-ing perfect

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

Negation

Simple form

I could not weaken
you could not weaken
he could not weaken
we could not weaken
you could not weaken
they could not weaken

V-ing form

I could not be weakening
you could not be weakening
he could not be weakening
we could not be weakening
you could not be weakening
they could not be weakening

Perfect

I could not have weakened
you could not have weakened
he could not have weakened
we could not have weakened
you could not have weakened
they could not have weakened

V-ing perfect

I could not have been weakening
you could not have been weakening
he could not have been weakening
we could not have been weakening
you could not have been weakening
they could not have been weakening

Interrogative form

Simple form

could I weaken?
could you weaken?
could he weaken?
could we weaken?
could you weaken?
could they weaken?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

could I not weaken?
could you not weaken?
could he not weaken?
could we not weaken?
could you not weaken?
could they not weaken?

V-ing form

could I not be weakening?
could you not be weakening?
could he not be weakening?
could we not be weakening?
could you not be weakening?
could they not be weakening?

Perfect

could I not have weakened?
could you not have weakened?
could he not have weakened?
could we not have weakened?
could you not have weakened?
could they not have weakened?

V-ing perfect

could I not have been weakening?
could you not have been weakening?
could he not have been weakening?
could we not have been weakening?
could you not have been weakening?
could they not have been weakening?

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