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