could argue
Regular verb: argue - argued- argued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could argue
you could argue
she could argue
we could argue
you could argue
they could argue 	I could be arguing
you could be arguing
she could be arguing
we could be arguing
you could be arguing
they could be arguing	I could have argued
you could have argued
she could have argued
we could have argued
you could have argued
they could have argued	I could have been arguing
you could have been arguing
she could have been arguing
we could have been arguing
you could have been arguing
they could have been arguing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't argue
you couldn't argue
she couldn't argue
we couldn't argue
you couldn't argue
they couldn't argue 	I couldn't be arguing
you couldn't be arguing
she couldn't be arguing
we couldn't be arguing
you couldn't be arguing
they couldn't be arguing	I couldn't have argued
you couldn't have argued
she couldn't have argued
we couldn't have argued
you couldn't have argued
they couldn't have argued	I couldn't have been arguing
you couldn't have been arguing
she couldn't have been arguing
we couldn't have been arguing
you couldn't have been arguing
they couldn't have been arguing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I argue?
could you argue?
could she argue?
could we argue?
could you argue?
could they argue? 	could I be arguing?
could you be arguing?
could she be arguing?
could we be arguing?
could you be arguing?
could they be arguing? 	could I have argued?
could you have argued?
could she have argued?
could we have argued?
could you have argued?
could they have argued? 	could I have been arguing?
could you have been arguing?
could she have been arguing?
could we have been arguing?
could you have been arguing?
could they have been arguing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I argue?
couldn't you argue?
couldn't she argue?
couldn't we argue?
couldn't you argue?
couldn't they argue? 	couldn't I be arguing?
couldn't you be arguing?
couldn't she be arguing?
couldn't we be arguing?
couldn't you be arguing?
couldn't they be arguing? 	couldn't I have argued?
couldn't you have argued?
couldn't she have argued?
couldn't we have argued?
couldn't you have argued?
couldn't they have argued? 	couldn't I have been arguing?
couldn't you have been arguing?
couldn't she have been arguing?
couldn't we have been arguing?
couldn't you have been arguing?
couldn't they have been arguing?