English verb conjugation
COULD FIB

Regular verb: fib - fibbed - fibbed

Affirmation

Simple form	V-ing form
I could fib you could fib she could fib we could fib you could fib they could fib	I could be fibbing you could be fibbing she could be fibbing we could be fibbing you could be fibbing they could be fibbing
Perfect	V-ing perfect
I could have fibbed you could have fibbed she could have fibbed we could have fibbed you could have fibbed they could have fibbed	I could have been fibbing you could have been fibbing she could have been fibbing we could have been fibbing you could have been fibbing they could have been fibbing

Negation

Simple form	V-ing form
I could not fib you could not fib she could not fib we could not fib you could not fib they could not fib	I could not be fibbing you could not be fibbing she could not be fibbing we could not be fibbing you could not be fibbing they could not be fibbing
Perfect	V-ing perfect
I could not have fibbed you could not have fibbed she could not have fibbed we could not have fibbed you could not have fibbed they could not have fibbed	I could not have been fibbing you could not have been fibbing she could not have been fibbing we could not have been fibbing you could not have been fibbing they could not have been fibbing

Interrogative form

Simple form	V-ing form
could I fib? could you fib? could she fib? could we fib? could you fib? could they fib?	could I be fibbing? could you be fibbing? could she be fibbing? could we be fibbing? could you be fibbing? could they be fibbing?
Perfect	V-ing perfect
could I have fibbed? could you have fibbed? could she have fibbed? could we have fibbed? could you have fibbed? could they have fibbed?	could I have been fibbing? could you have been fibbing? could she have been fibbing? could we have been fibbing? could you have been fibbing? could they have been fibbing?

Interro-negative form

Simple form	V-ing form
could I not fib? could you not fib? could she not fib? could we not fib? could you not fib? could they not fib?	could I not be fibbing? could you not be fibbing? could she not be fibbing? could we not be fibbing? could you not be fibbing? could they not be fibbing?
Perfect	V-ing perfect
could I not have fibbed? could you not have fibbed? could she not have fibbed? could we not have fibbed? could you not have fibbed? could they not have fibbed?	could I not have been fibbing? could you not have been fibbing? could she not have been fibbing? could we not have been fibbing? could you not have been fibbing? could they not have been fibbing?