English verb conjugation
COULD SLIP

Regular verb: slip - slipped - slipped

Affirmation

Simple form	V-ing form
I could slip you could slip she could slip we could slip you could slip they could slip	I could be slipping you could be slipping she could be slipping we could be slipping you could be slipping they could be slipping
Perfect	V-ing perfect
I could have slipped you could have slipped she could have slipped we could have slipped you could have slipped they could have slipped	I could have been slipping you could have been slipping she could have been slipping we could have been slipping you could have been slipping they could have been slipping

Negation

Simple form	V-ing form
I could not slip you could not slip she could not slip we could not slip you could not slip they could not slip	I could not be slipping you could not be slipping she could not be slipping we could not be slipping you could not be slipping they could not be slipping
Perfect	V-ing perfect
I could not have slipped you could not have slipped she could not have slipped we could not have slipped you could not have slipped they could not have slipped	I could not have been slipping you could not have been slipping she could not have been slipping we could not have been slipping you could not have been slipping they could not have been slipping

Interrogative form

Simple form	V-ing form
could I slip? could you slip? could she slip? could we slip? could you slip? could they slip?	could I be slipping? could you be slipping? could she be slipping? could we be slipping? could you be slipping? could they be slipping?
Perfect	V-ing perfect
could I have slipped? could you have slipped? could she have slipped? could we have slipped? could you have slipped? could they have slipped?	could I have been slipping? could you have been slipping? could she have been slipping? could we have been slipping? could you have been slipping? could they have been slipping?

Interro-negative form

Simple form	V-ing form
could I not slip? could you not slip? could she not slip? could we not slip? could you not slip? could they not slip?	could I not be slipping? could you not be slipping? could she not be slipping? could we not be slipping? could you not be slipping? could they not be slipping?
Perfect	V-ing perfect
could I not have slipped? could you not have slipped? could she not have slipped? could we not have slipped? could you not have slipped? could they not have slipped?	could I not have been slipping? could you not have been slipping? could she not have been slipping? could we not have been slipping? could you not have been slipping? could they not have been slipping?