English verb conjugation COULD STRENGTHEN

Regular verb: strengthen - strengthened - strengthened

Affirmation

Simple form

I could strengthen
you could strengthen
he could strengthen
we could strengthen
you could strengthen
they could strengthen

V-ing form

I could be strengthening
you could be strengthening
he could be strengthening
we could be strengthening
you could be strengthening
they could be strengthening

Perfect

I could have strengthened
you could have strengthened
he could have strengthened
we could have strengthened
you could have strengthened
they could have strengthened

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I strengthen?
could you strengthen?
could he strengthen?
could we strengthen?
could you strengthen?
could they strengthen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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