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