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 could not skidoo you could not skidoo he could not skidoo we could not skidoo you could not skidoo they could not skidoo	I could not be skidooing you could not be skidooing he could not be skidooing we could not be skidooing you could not be skidooing they could not be skidooing
Perfect	V-ing perfect
I could not have skidooed you could not have skidooed he could not have skidooed we could not have skidooed you could not have skidooed they could not have skidooed	I could not have been skidooing you could not have been skidooing he could not have been skidooing we could not have been skidooing you could not have been skidooing they could not 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
could I not skidoo? could you not skidoo? could he not skidoo? could we not skidoo? could you not skidoo? could they not skidoo?	could I not be skidooing? could you not be skidooing? could he not be skidooing? could we not be skidooing? could you not be skidooing? could they not be skidooing?
Perfect	V-ing perfect
could I not have skidooed? could you not have skidooed? could he not have skidooed? could we not have skidooed? could you not have skidooed? could they not have skidooed?	could I not have been skidooing? could you not have been skidooing? could he not have been skidooing? could we not have been skidooing? could you not have been skidooing? could they not have been skidooing?