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