English verb conjugation COULD YELP

Regular verb: yelp - yelped - yelped

Affirmation

Simple form

I could yelp
you could yelp
he could yelp
we could yelp
you could yelp
they could yelp

V-ing form

I could be yelping
you could be yelping
he could be yelping
we could be yelping
you could be yelping
they could be yelping

Perfect

I could have yelped
you could have yelped
he could have yelped
we could have yelped
you could have yelped
they could have yelped

V-ing perfect

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

Negation

Simple form

I could not yelp
you could not yelp
he could not yelp
we could not yelp
you could not yelp
they could not yelp

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I yelp?
could you yelp?
could he yelp?
could we yelp?
could you yelp?
could they yelp?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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