should clack
Regular verb: clack - clacked- clacked

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not clack
you should not clack
she should not clack
we should not clack
you should not clack
they should not clack 	I should not be clacking
you should not be clacking
she should not be clacking
we should not be clacking
you should not be clacking
they should not be clacking	I should not have clacked
you should not have clacked
she should not have clacked
we should not have clacked
you should not have clacked
they should not have clacked	I should not have been clacking
you should not have been clacking
she should not have been clacking
we should not have been clacking
you should not have been clacking
they should not 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 	
should I not clack?
should you not clack?
should she not clack?
should we not clack?
should you not clack?
should they not clack? 	should I not be clacking?
should you not be clacking?
should she not be clacking?
should we not be clacking?
should you not be clacking?
should they not be clacking? 	should I not have clacked?
should you not have clacked?
should she not have clacked?
should we not have clacked?
should you not have clacked?
should they not have clacked? 	should I not have been clacking?
should you not have been clacking?
should she not have been clacking?
should we not have been clacking?
should you not have been clacking?
should they not have been clacking?