I could ax you could ax she could ax we could ax you could ax they could ax
V-ing form
I could be axing you could be axing she could be axing we could be axing you could be axing they could be axing
Perfect
I could have axed you could have axed she could have axed we could have axed you could have axed they could have axed
V-ing perfect
I could have been axing you could have been axing she could have been axing we could have been axing you could have been axing they could have been axing
Negation
Simple form
I couldn't ax you couldn't ax she couldn't ax we couldn't ax you couldn't ax they couldn't ax
V-ing form
I couldn't be axing you couldn't be axing she couldn't be axing we couldn't be axing you couldn't be axing they couldn't be axing
Perfect
I couldn't have axed you couldn't have axed she couldn't have axed we couldn't have axed you couldn't have axed they couldn't have axed
V-ing perfect
I couldn't have been axing you couldn't have been axing she couldn't have been axing we couldn't have been axing you couldn't have been axing they couldn't have been axing
Interrogative form
Simple form
could I ax? could you ax? could she ax? could we ax? could you ax? could they ax?
V-ing form
could I be axing? could you be axing? could she be axing? could we be axing? could you be axing? could they be axing?
Perfect
could I have axed? could you have axed? could she have axed? could we have axed? could you have axed? could they have axed?
V-ing perfect
could I have been axing? could you have been axing? could she have been axing? could we have been axing? could you have been axing? could they have been axing?
Interro-negative form
Simple form
couldn't I ax? couldn't you ax? couldn't she ax? couldn't we ax? couldn't you ax? couldn't they ax?
V-ing form
couldn't I be axing? couldn't you be axing? couldn't she be axing? couldn't we be axing? couldn't you be axing? couldn't they be axing?
Perfect
couldn't I have axed? couldn't you have axed? couldn't she have axed? couldn't we have axed? couldn't you have axed? couldn't they have axed?
V-ing perfect
couldn't I have been axing? couldn't you have been axing? couldn't she have been axing? couldn't we have been axing? couldn't you have been axing? couldn't they have been axing?