English verb conjugation
COULD SKIDOO

Regular verb: skidoo - skidooed - skidooed

Affirmation

Simple form	V-ing form
I could skidoo you could skidoo he could skidoo we could skidoo you could skidoo they could skidoo	I could be skidooing you could be skidooing he could be skidooing we could be skidooing you could be skidooing they could be skidooing
Perfect	V-ing perfect
I could have skidooed you could have skidooed he could have skidooed we could have skidooed you could have skidooed they could have skidooed	I could have been skidooing you could have been skidooing he could have been skidooing we could have been skidooing you could have been skidooing they could have been skidooing

Negation

Simple form	V-ing form
I couldn't skidoo you couldn't skidoo he couldn't skidoo we couldn't skidoo you couldn't skidoo they couldn't skidoo	I couldn't be skidooing you couldn't be skidooing he couldn't be skidooing we couldn't be skidooing you couldn't be skidooing they couldn't be skidooing
Perfect	V-ing perfect
I couldn't have skidooed you couldn't have skidooed he couldn't have skidooed we couldn't have skidooed you couldn't have skidooed they couldn't have skidooed	I couldn't have been skidooing you couldn't have been skidooing he couldn't have been skidooing we couldn't have been skidooing you couldn't have been skidooing they couldn't have been skidooing

Interrogative form

Simple form	V-ing form
could I skidoo? could you skidoo? could he skidoo? could we skidoo? could you skidoo? could they skidoo?	could I be skidooing? could you be skidooing? could he be skidooing? could we be skidooing? could you be skidooing? could they be skidooing?
Perfect	V-ing perfect
could I have skidooed? could you have skidooed? could he have skidooed? could we have skidooed? could you have skidooed? could they have skidooed?	could I have been skidooing? could you have been skidooing? could he have been skidooing? could we have been skidooing? could you have been skidooing? could they have been skidooing?

Interro-negative form

Simple form	V-ing form
couldn't I skidoo? couldn't you skidoo? couldn't he skidoo? couldn't we skidoo? couldn't you skidoo? couldn't they skidoo?	couldn't I be skidooing? couldn't you be skidooing? couldn't he be skidooing? couldn't we be skidooing? couldn't you be skidooing? couldn't they be skidooing?
Perfect	V-ing perfect
couldn't I have skidooed? couldn't you have skidooed? couldn't he have skidooed? couldn't we have skidooed? couldn't you have skidooed? couldn't they have skidooed?	couldn't I have been skidooing? couldn't you have been skidooing? couldn't he have been skidooing? couldn't we have been skidooing? couldn't you have been skidooing? couldn't they have been skidooing?