should prefer
Regular verb: prefer - preferred- preferred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd prefer
you'd prefer
he'd prefer
we'd prefer
you'd prefer
they'd prefer 	I'd be preferring
you'd be preferring
he'd be preferring
we'd be preferring
you'd be preferring
they'd be preferring	I should've preferred
you should've preferred
he should've preferred
we should've preferred
you should've preferred
they should've preferred	I should've been preferring
you should've been preferring
he should've been preferring
we should've been preferring
you should've been preferring
they should've been preferring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't prefer
you shouldn't prefer
he shouldn't prefer
we shouldn't prefer
you shouldn't prefer
they shouldn't prefer 	I shouldn't be preferring
you shouldn't be preferring
he shouldn't be preferring
we shouldn't be preferring
you shouldn't be preferring
they shouldn't be preferring	I shouldn't have preferred
you shouldn't have preferred
he shouldn't have preferred
we shouldn't have preferred
you shouldn't have preferred
they shouldn't have preferred	I shouldn't have been preferring
you shouldn't have been preferring
he shouldn't have been preferring
we shouldn't have been preferring
you shouldn't have been preferring
they shouldn't have been preferring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I prefer?
should you prefer?
should he prefer?
should we prefer?
should you prefer?
should they prefer? 	should I be preferring?
should you be preferring?
should he be preferring?
should we be preferring?
should you be preferring?
should they be preferring? 	should I have preferred?
should you have preferred?
should he have preferred?
should we have preferred?
should you have preferred?
should they have preferred? 	should I have been preferring?
should you have been preferring?
should he have been preferring?
should we have been preferring?
should you have been preferring?
should they have been preferring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I prefer?
shouldn't you prefer?
shouldn't he prefer?
shouldn't we prefer?
shouldn't you prefer?
shouldn't they prefer? 	shouldn't I be preferring?
shouldn't you be preferring?
shouldn't he be preferring?
shouldn't we be preferring?
shouldn't you be preferring?
shouldn't they be preferring? 	shouldn't I have preferred?
shouldn't you have preferred?
shouldn't he have preferred?
shouldn't we have preferred?
shouldn't you have preferred?
shouldn't they have preferred? 	shouldn't I have been preferring?
shouldn't you have been preferring?
shouldn't he have been preferring?
shouldn't we have been preferring?
shouldn't you have been preferring?
shouldn't they have been preferring?