English verb conjugation COULD SKETCH

Regular verb: sketch - sketched - sketched

Affirmation

Simple form

I could sketch
you could sketch
he could sketch
we could sketch
you could sketch
they could sketch

V-ing form

I could be sketching
you could be sketching
he could be sketching
we could be sketching
you could be sketching
they could be sketching

Perfect

I could have sketched
you could have sketched
he could have sketched
we could have sketched
you could have sketched
they could have sketched

V-ing perfect

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

Negation

Simple form

I could not sketch
you could not sketch
he could not sketch
we could not sketch
you could not sketch
they could not sketch

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I sketch?
could you sketch?
could he sketch?
could we sketch?
could you sketch?
could they sketch?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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