English verb conjugation
COULD SKIRL

Regular verb: skirl - skirled - skirled

Affirmation

Simple form	V-ing form
I could skirl you could skirl he could skirl we could skirl you could skirl they could skirl	I could be skirling you could be skirling he could be skirling we could be skirling you could be skirling they could be skirling
Perfect	V-ing perfect
I could have skirled you could have skirled he could have skirled we could have skirled you could have skirled they could have skirled	I could have been skirling you could have been skirling he could have been skirling we could have been skirling you could have been skirling they could have been skirling

Negation

Simple form	V-ing form
I couldn't skirl you couldn't skirl he couldn't skirl we couldn't skirl you couldn't skirl they couldn't skirl	I couldn't be skirling you couldn't be skirling he couldn't be skirling we couldn't be skirling you couldn't be skirling they couldn't be skirling
Perfect	V-ing perfect
I couldn't have skirled you couldn't have skirled he couldn't have skirled we couldn't have skirled you couldn't have skirled they couldn't have skirled	I couldn't have been skirling you couldn't have been skirling he couldn't have been skirling we couldn't have been skirling you couldn't have been skirling they couldn't have been skirling

Interrogative form

Simple form	V-ing form
could I skirl? could you skirl? could he skirl? could we skirl? could you skirl? could they skirl?	could I be skirling? could you be skirling? could he be skirling? could we be skirling? could you be skirling? could they be skirling?
Perfect	V-ing perfect
could I have skirled? could you have skirled? could he have skirled? could we have skirled? could you have skirled? could they have skirled?	could I have been skirling? could you have been skirling? could he have been skirling? could we have been skirling? could you have been skirling? could they have been skirling?

Interro-negative form

Simple form	V-ing form
couldn't I skirl? couldn't you skirl? couldn't he skirl? couldn't we skirl? couldn't you skirl? couldn't they skirl?	couldn't I be skirling? couldn't you be skirling? couldn't he be skirling? couldn't we be skirling? couldn't you be skirling? couldn't they be skirling?
Perfect	V-ing perfect
couldn't I have skirled? couldn't you have skirled? couldn't he have skirled? couldn't we have skirled? couldn't you have skirled? couldn't they have skirled?	couldn't I have been skirling? couldn't you have been skirling? couldn't he have been skirling? couldn't we have been skirling? couldn't you have been skirling? couldn't they have been skirling?