English verb conjugation
SHOULD FIB

Regular verb: fib - fibbed - fibbed

Affirmation

Simple form	V-ing form
I'd fib you'd fib he'd fib we'd fib you'd fib they'd fib	I'd be fibbing you'd be fibbing he'd be fibbing we'd be fibbing you'd be fibbing they'd be fibbing
Perfect	V-ing perfect
I should've fibbed you should've fibbed he should've fibbed we should've fibbed you should've fibbed they should've fibbed	I should've been fibbing you should've been fibbing he should've been fibbing we should've been fibbing you should've been fibbing they should've been fibbing

Negation

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

Interrogative form

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

Interro-negative form

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