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