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 couldn't yellow
you couldn't yellow
he couldn't yellow
we couldn't yellow
you couldn't yellow
they couldn't yellow

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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