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