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