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 couldn't weaken
you couldn't weaken
he couldn't weaken
we couldn't weaken
you couldn't weaken
they couldn't weaken

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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