should clack
Regular verb: clack - clacked- clacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd clack
you'd clack
she'd clack
we'd clack
you'd clack
they'd clack 	I'd be clacking
you'd be clacking
she'd be clacking
we'd be clacking
you'd be clacking
they'd be clacking	I should've clacked
you should've clacked
she should've clacked
we should've clacked
you should've clacked
they should've clacked	I should've been clacking
you should've been clacking
she should've been clacking
we should've been clacking
you should've been clacking
they should've been clacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't clack
you shouldn't clack
she shouldn't clack
we shouldn't clack
you shouldn't clack
they shouldn't clack 	I shouldn't be clacking
you shouldn't be clacking
she shouldn't be clacking
we shouldn't be clacking
you shouldn't be clacking
they shouldn't be clacking	I shouldn't have clacked
you shouldn't have clacked
she shouldn't have clacked
we shouldn't have clacked
you shouldn't have clacked
they shouldn't have clacked	I shouldn't have been clacking
you shouldn't have been clacking
she shouldn't have been clacking
we shouldn't have been clacking
you shouldn't have been clacking
they shouldn't have been clacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I clack?
should you clack?
should she clack?
should we clack?
should you clack?
should they clack? 	should I be clacking?
should you be clacking?
should she be clacking?
should we be clacking?
should you be clacking?
should they be clacking? 	should I have clacked?
should you have clacked?
should she have clacked?
should we have clacked?
should you have clacked?
should they have clacked? 	should I have been clacking?
should you have been clacking?
should she have been clacking?
should we have been clacking?
should you have been clacking?
should they have been clacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I clack?
shouldn't you clack?
shouldn't she clack?
shouldn't we clack?
shouldn't you clack?
shouldn't they clack? 	shouldn't I be clacking?
shouldn't you be clacking?
shouldn't she be clacking?
shouldn't we be clacking?
shouldn't you be clacking?
shouldn't they be clacking? 	shouldn't I have clacked?
shouldn't you have clacked?
shouldn't she have clacked?
shouldn't we have clacked?
shouldn't you have clacked?
shouldn't they have clacked? 	shouldn't I have been clacking?
shouldn't you have been clacking?
shouldn't she have been clacking?
shouldn't we have been clacking?
shouldn't you have been clacking?
shouldn't they have been clacking?