can prefer
Regular verb: prefer - preferred- preferred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can prefer
you can prefer
she can prefer
we can prefer
you can prefer
they can prefer 	I can be preferring
you can be preferring
she can be preferring
we can be preferring
you can be preferring
they can be preferring	I can have preferred
you can have preferred
she can have preferred
we can have preferred
you can have preferred
they can have preferred	I can have been preferring
you can have been preferring
she can have been preferring
we can have been preferring
you can have been preferring
they can have been preferring	

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

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

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