English verb conjugation COULD YELLOW

Regular verb: yellow - yellowed - yellowed

Affirmation

Simple form

I could yellow
you could yellow
he could yellow
we could yellow
you could yellow
they could yellow

V-ing form

I could be yellowing
you could be yellowing
he could be yellowing
we could be yellowing
you could be yellowing
they could be yellowing

Perfect

I could have yellowed
you could have yellowed
he could have yellowed
we could have yellowed
you could have yellowed
they could have yellowed

V-ing perfect

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

Negation

Simple form

I could not yellow
you could not yellow
he could not yellow
we could not yellow
you could not yellow
they could not yellow

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I yellow?
could you yellow?
could he yellow?
could we yellow?
could you yellow?
could they yellow?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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