could debug
Regular verb: debug - debugged- debugged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could debug
you could debug
he could debug
we could debug
you could debug
they could debug 	I could be debugging
you could be debugging
he could be debugging
we could be debugging
you could be debugging
they could be debugging	I could have debugged
you could have debugged
he could have debugged
we could have debugged
you could have debugged
they could have debugged	I could have been debugging
you could have been debugging
he could have been debugging
we could have been debugging
you could have been debugging
they could have been debugging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't debug
you couldn't debug
he couldn't debug
we couldn't debug
you couldn't debug
they couldn't debug 	I couldn't be debugging
you couldn't be debugging
he couldn't be debugging
we couldn't be debugging
you couldn't be debugging
they couldn't be debugging	I couldn't have debugged
you couldn't have debugged
he couldn't have debugged
we couldn't have debugged
you couldn't have debugged
they couldn't have debugged	I couldn't have been debugging
you couldn't have been debugging
he couldn't have been debugging
we couldn't have been debugging
you couldn't have been debugging
they couldn't have been debugging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I debug?
could you debug?
could he debug?
could we debug?
could you debug?
could they debug? 	could I be debugging?
could you be debugging?
could he be debugging?
could we be debugging?
could you be debugging?
could they be debugging? 	could I have debugged?
could you have debugged?
could he have debugged?
could we have debugged?
could you have debugged?
could they have debugged? 	could I have been debugging?
could you have been debugging?
could he have been debugging?
could we have been debugging?
could you have been debugging?
could they have been debugging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I debug?
couldn't you debug?
couldn't he debug?
couldn't we debug?
couldn't you debug?
couldn't they debug? 	couldn't I be debugging?
couldn't you be debugging?
couldn't he be debugging?
couldn't we be debugging?
couldn't you be debugging?
couldn't they be debugging? 	couldn't I have debugged?
couldn't you have debugged?
couldn't he have debugged?
couldn't we have debugged?
couldn't you have debugged?
couldn't they have debugged? 	couldn't I have been debugging?
couldn't you have been debugging?
couldn't he have been debugging?
couldn't we have been debugging?
couldn't you have been debugging?
couldn't they have been debugging?