could conk
Regular verb: conk - conked- conked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could conk
you could conk
she could conk
we could conk
you could conk
they could conk 	I could be conking
you could be conking
she could be conking
we could be conking
you could be conking
they could be conking	I could have conked
you could have conked
she could have conked
we could have conked
you could have conked
they could have conked	I could have been conking
you could have been conking
she could have been conking
we could have been conking
you could have been conking
they could have been conking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't conk
you couldn't conk
she couldn't conk
we couldn't conk
you couldn't conk
they couldn't conk 	I couldn't be conking
you couldn't be conking
she couldn't be conking
we couldn't be conking
you couldn't be conking
they couldn't be conking	I couldn't have conked
you couldn't have conked
she couldn't have conked
we couldn't have conked
you couldn't have conked
they couldn't have conked	I couldn't have been conking
you couldn't have been conking
she couldn't have been conking
we couldn't have been conking
you couldn't have been conking
they couldn't have been conking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I conk?
could you conk?
could she conk?
could we conk?
could you conk?
could they conk? 	could I be conking?
could you be conking?
could she be conking?
could we be conking?
could you be conking?
could they be conking? 	could I have conked?
could you have conked?
could she have conked?
could we have conked?
could you have conked?
could they have conked? 	could I have been conking?
could you have been conking?
could she have been conking?
could we have been conking?
could you have been conking?
could they have been conking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I conk?
couldn't you conk?
couldn't she conk?
couldn't we conk?
couldn't you conk?
couldn't they conk? 	couldn't I be conking?
couldn't you be conking?
couldn't she be conking?
couldn't we be conking?
couldn't you be conking?
couldn't they be conking? 	couldn't I have conked?
couldn't you have conked?
couldn't she have conked?
couldn't we have conked?
couldn't you have conked?
couldn't they have conked? 	couldn't I have been conking?
couldn't you have been conking?
couldn't she have been conking?
couldn't we have been conking?
couldn't you have been conking?
couldn't they have been conking?