English verb conjugation
CAN FIB

Regular verb: fib - fibbed - fibbed

Affirmation

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

Negation

Simple form	V-ing form
I can't fib you can't fib he can't fib we can't fib you can't fib they can't fib	I can't be fibbing you can't be fibbing he can't be fibbing we can't be fibbing you can't be fibbing they can't be fibbing
Perfect	V-ing perfect
I can't have fibbed you can't have fibbed he can't have fibbed we can't have fibbed you can't have fibbed they can't have fibbed	I can't have been fibbing you can't have been fibbing he can't have been fibbing we can't have been fibbing you can't have been fibbing they can't have been fibbing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I fib? can't you fib? can't he fib? can't we fib? can't you fib? can't they fib?	can't I be fibbing? can't you be fibbing? can't he be fibbing? can't we be fibbing? can't you be fibbing? can't they be fibbing?
Perfect	V-ing perfect
can't I have fibbed? can't you have fibbed? can't he have fibbed? can't we have fibbed? can't you have fibbed? can't they have fibbed?	can't I have been fibbing? can't you have been fibbing? can't he have been fibbing? can't we have been fibbing? can't you have been fibbing? can't they have been fibbing?