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