could sleek
Regular verb: sleek - sleeked- sleeked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sleek
you could sleek
she could sleek
we could sleek
you could sleek
they could sleek 	I could be sleeking
you could be sleeking
she could be sleeking
we could be sleeking
you could be sleeking
they could be sleeking	I could have sleeked
you could have sleeked
she 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
she 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 couldn't sleek
you couldn't sleek
she couldn't sleek
we couldn't sleek
you couldn't sleek
they couldn't sleek 	I couldn't be sleeking
you couldn't be sleeking
she couldn't be sleeking
we couldn't be sleeking
you couldn't be sleeking
they couldn't be sleeking	I couldn't have sleeked
you couldn't have sleeked
she couldn't have sleeked
we couldn't have sleeked
you couldn't have sleeked
they couldn't have sleeked	I couldn't have been sleeking
you couldn't have been sleeking
she couldn't have been sleeking
we couldn't have been sleeking
you couldn't have been sleeking
they couldn't have been sleeking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sleek?
could you sleek?
could she sleek?
could we sleek?
could you sleek?
could they sleek? 	could I be sleeking?
could you be sleeking?
could she be sleeking?
could we be sleeking?
could you be sleeking?
could they be sleeking? 	could I have sleeked?
could you have sleeked?
could she 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 she 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 	
couldn't I sleek?
couldn't you sleek?
couldn't she sleek?
couldn't we sleek?
couldn't you sleek?
couldn't they sleek? 	couldn't I be sleeking?
couldn't you be sleeking?
couldn't she be sleeking?
couldn't we be sleeking?
couldn't you be sleeking?
couldn't they be sleeking? 	couldn't I have sleeked?
couldn't you have sleeked?
couldn't she have sleeked?
couldn't we have sleeked?
couldn't you have sleeked?
couldn't they have sleeked? 	couldn't I have been sleeking?
couldn't you have been sleeking?
couldn't she have been sleeking?
couldn't we have been sleeking?
couldn't you have been sleeking?
couldn't they have been sleeking?