could discuss
Regular verb: discuss - discussed- discussed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could discuss
you could discuss
he could discuss
we could discuss
you could discuss
they could discuss 	I could be discussing
you could be discussing
he could be discussing
we could be discussing
you could be discussing
they could be discussing	I could have discussed
you could have discussed
he could have discussed
we could have discussed
you could have discussed
they could have discussed	I could have been discussing
you could have been discussing
he could have been discussing
we could have been discussing
you could have been discussing
they could have been discussing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't discuss
you couldn't discuss
he couldn't discuss
we couldn't discuss
you couldn't discuss
they couldn't discuss 	I couldn't be discussing
you couldn't be discussing
he couldn't be discussing
we couldn't be discussing
you couldn't be discussing
they couldn't be discussing	I couldn't have discussed
you couldn't have discussed
he couldn't have discussed
we couldn't have discussed
you couldn't have discussed
they couldn't have discussed	I couldn't have been discussing
you couldn't have been discussing
he couldn't have been discussing
we couldn't have been discussing
you couldn't have been discussing
they couldn't have been discussing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I discuss?
could you discuss?
could he discuss?
could we discuss?
could you discuss?
could they discuss? 	could I be discussing?
could you be discussing?
could he be discussing?
could we be discussing?
could you be discussing?
could they be discussing? 	could I have discussed?
could you have discussed?
could he have discussed?
could we have discussed?
could you have discussed?
could they have discussed? 	could I have been discussing?
could you have been discussing?
could he have been discussing?
could we have been discussing?
could you have been discussing?
could they have been discussing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I discuss?
couldn't you discuss?
couldn't he discuss?
couldn't we discuss?
couldn't you discuss?
couldn't they discuss? 	couldn't I be discussing?
couldn't you be discussing?
couldn't he be discussing?
couldn't we be discussing?
couldn't you be discussing?
couldn't they be discussing? 	couldn't I have discussed?
couldn't you have discussed?
couldn't he have discussed?
couldn't we have discussed?
couldn't you have discussed?
couldn't they have discussed? 	couldn't I have been discussing?
couldn't you have been discussing?
couldn't he have been discussing?
couldn't we have been discussing?
couldn't you have been discussing?
couldn't they have been discussing?