I could accent you could accent he could accent we could accent you could accent they could accent
V-ing form
I could be accenting you could be accenting he could be accenting we could be accenting you could be accenting they could be accenting
Perfect
I could have accented you could have accented he could have accented we could have accented you could have accented they could have accented
V-ing perfect
I could have been accenting you could have been accenting he could have been accenting we could have been accenting you could have been accenting they could have been accenting
Negation
Simple form
I couldn't accent you couldn't accent he couldn't accent we couldn't accent you couldn't accent they couldn't accent
V-ing form
I couldn't be accenting you couldn't be accenting he couldn't be accenting we couldn't be accenting you couldn't be accenting they couldn't be accenting
Perfect
I couldn't have accented you couldn't have accented he couldn't have accented we couldn't have accented you couldn't have accented they couldn't have accented
V-ing perfect
I couldn't have been accenting you couldn't have been accenting he couldn't have been accenting we couldn't have been accenting you couldn't have been accenting they couldn't have been accenting
Interrogative form
Simple form
could I accent? could you accent? could he accent? could we accent? could you accent? could they accent?
V-ing form
could I be accenting? could you be accenting? could he be accenting? could we be accenting? could you be accenting? could they be accenting?
Perfect
could I have accented? could you have accented? could he have accented? could we have accented? could you have accented? could they have accented?
V-ing perfect
could I have been accenting? could you have been accenting? could he have been accenting? could we have been accenting? could you have been accenting? could they have been accenting?
Interro-negative form
Simple form
couldn't I accent? couldn't you accent? couldn't he accent? couldn't we accent? couldn't you accent? couldn't they accent?
V-ing form
couldn't I be accenting? couldn't you be accenting? couldn't he be accenting? couldn't we be accenting? couldn't you be accenting? couldn't they be accenting?
Perfect
couldn't I have accented? couldn't you have accented? couldn't he have accented? couldn't we have accented? couldn't you have accented? couldn't they have accented?
V-ing perfect
couldn't I have been accenting? couldn't you have been accenting? couldn't he have been accenting? couldn't we have been accenting? couldn't you have been accenting? couldn't they have been accenting?