can sketch
Regular verb: sketch - sketched- sketched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can sketch
you can sketch
he can sketch
we can sketch
you can sketch
they can sketch 	I can be sketching
you can be sketching
he can be sketching
we can be sketching
you can be sketching
they can be sketching	I can have sketched
you can have sketched
he can have sketched
we can have sketched
you can have sketched
they can have sketched	I can have been sketching
you can have been sketching
he can have been sketching
we can have been sketching
you can have been sketching
they can have been sketching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot sketch
you cannot sketch
he cannot sketch
we cannot sketch
you cannot sketch
they cannot sketch 	I cannot be sketching
you cannot be sketching
he cannot be sketching
we cannot be sketching
you cannot be sketching
they cannot be sketching	I cannot have sketched
you cannot have sketched
he cannot have sketched
we cannot have sketched
you cannot have sketched
they cannot have sketched	I cannot have been sketching
you cannot have been sketching
he cannot have been sketching
we cannot have been sketching
you cannot have been sketching
they cannot have been sketching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I sketch?
can you sketch?
can he sketch?
can we sketch?
can you sketch?
can they sketch? 	can I be sketching?
can you be sketching?
can he be sketching?
can we be sketching?
can you be sketching?
can they be sketching? 	can I have sketched?
can you have sketched?
can he have sketched?
can we have sketched?
can you have sketched?
can they have sketched? 	can I have been sketching?
can you have been sketching?
can he have been sketching?
can we have been sketching?
can you have been sketching?
can they have been sketching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not sketch?
can you not sketch?
can he not sketch?
can we not sketch?
can you not sketch?
can they not sketch? 	can I not be sketching?
can you not be sketching?
can he not be sketching?
can we not be sketching?
can you not be sketching?
can they not be sketching? 	can I not have sketched?
can you not have sketched?
can he not have sketched?
can we not have sketched?
can you not have sketched?
can they not have sketched? 	can I not have been sketching?
can you not have been sketching?
can he not have been sketching?
can we not have been sketching?
can you not have been sketching?
can they not have been sketching?