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 couldn't sketch
you couldn't sketch
he couldn't sketch
we couldn't sketch
you couldn't sketch
they couldn't sketch

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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