should curb
Regular verb: curb - curbed- curbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd curb
you'd curb
she'd curb
we'd curb
you'd curb
they'd curb 	I'd be curbing
you'd be curbing
she'd be curbing
we'd be curbing
you'd be curbing
they'd be curbing	I should've curbed
you should've curbed
she should've curbed
we should've curbed
you should've curbed
they should've curbed	I should've been curbing
you should've been curbing
she should've been curbing
we should've been curbing
you should've been curbing
they should've been curbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't curb
you shouldn't curb
she shouldn't curb
we shouldn't curb
you shouldn't curb
they shouldn't curb 	I shouldn't be curbing
you shouldn't be curbing
she shouldn't be curbing
we shouldn't be curbing
you shouldn't be curbing
they shouldn't be curbing	I shouldn't have curbed
you shouldn't have curbed
she shouldn't have curbed
we shouldn't have curbed
you shouldn't have curbed
they shouldn't have curbed	I shouldn't have been curbing
you shouldn't have been curbing
she shouldn't have been curbing
we shouldn't have been curbing
you shouldn't have been curbing
they shouldn't have been curbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I curb?
should you curb?
should she curb?
should we curb?
should you curb?
should they curb? 	should I be curbing?
should you be curbing?
should she be curbing?
should we be curbing?
should you be curbing?
should they be curbing? 	should I have curbed?
should you have curbed?
should she have curbed?
should we have curbed?
should you have curbed?
should they have curbed? 	should I have been curbing?
should you have been curbing?
should she have been curbing?
should we have been curbing?
should you have been curbing?
should they have been curbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I curb?
shouldn't you curb?
shouldn't she curb?
shouldn't we curb?
shouldn't you curb?
shouldn't they curb? 	shouldn't I be curbing?
shouldn't you be curbing?
shouldn't she be curbing?
shouldn't we be curbing?
shouldn't you be curbing?
shouldn't they be curbing? 	shouldn't I have curbed?
shouldn't you have curbed?
shouldn't she have curbed?
shouldn't we have curbed?
shouldn't you have curbed?
shouldn't they have curbed? 	shouldn't I have been curbing?
shouldn't you have been curbing?
shouldn't she have been curbing?
shouldn't we have been curbing?
shouldn't you have been curbing?
shouldn't they have been curbing?