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