could sleek
Regular verb: sleek - sleeked- sleeked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sleek
you could sleek
he could sleek
we could sleek
you could sleek
they could sleek 	I could be sleeking
you could be sleeking
he could be sleeking
we could be sleeking
you could be sleeking
they could be sleeking	I could have sleeked
you could have sleeked
he could have sleeked
we could have sleeked
you could have sleeked
they could have sleeked	I could have been sleeking
you could have been sleeking
he could have been sleeking
we could have been sleeking
you could have been sleeking
they could have been sleeking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sleek
you could not sleek
he could not sleek
we could not sleek
you could not sleek
they could not sleek 	I could not be sleeking
you could not be sleeking
he could not be sleeking
we could not be sleeking
you could not be sleeking
they could not be sleeking	I could not have sleeked
you could not have sleeked
he could not have sleeked
we could not have sleeked
you could not have sleeked
they could not have sleeked	I could not have been sleeking
you could not have been sleeking
he could not have been sleeking
we could not have been sleeking
you could not have been sleeking
they could not have been sleeking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sleek?
could you sleek?
could he sleek?
could we sleek?
could you sleek?
could they sleek? 	could I be sleeking?
could you be sleeking?
could he be sleeking?
could we be sleeking?
could you be sleeking?
could they be sleeking? 	could I have sleeked?
could you have sleeked?
could he have sleeked?
could we have sleeked?
could you have sleeked?
could they have sleeked? 	could I have been sleeking?
could you have been sleeking?
could he have been sleeking?
could we have been sleeking?
could you have been sleeking?
could they have been sleeking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sleek?
could you not sleek?
could he not sleek?
could we not sleek?
could you not sleek?
could they not sleek? 	could I not be sleeking?
could you not be sleeking?
could he not be sleeking?
could we not be sleeking?
could you not be sleeking?
could they not be sleeking? 	could I not have sleeked?
could you not have sleeked?
could he not have sleeked?
could we not have sleeked?
could you not have sleeked?
could they not have sleeked? 	could I not have been sleeking?
could you not have been sleeking?
could he not have been sleeking?
could we not have been sleeking?
could you not have been sleeking?
could they not have been sleeking?