should crack
Regular verb: crack - cracked- cracked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd crack
you'd crack
she'd crack
we'd crack
you'd crack
they'd crack 	I'd be cracking
you'd be cracking
she'd be cracking
we'd be cracking
you'd be cracking
they'd be cracking	I should've cracked
you should've cracked
she should've cracked
we should've cracked
you should've cracked
they should've cracked	I should've been cracking
you should've been cracking
she should've been cracking
we should've been cracking
you should've been cracking
they should've been cracking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't crack
you shouldn't crack
she shouldn't crack
we shouldn't crack
you shouldn't crack
they shouldn't crack 	I shouldn't be cracking
you shouldn't be cracking
she shouldn't be cracking
we shouldn't be cracking
you shouldn't be cracking
they shouldn't be cracking	I shouldn't have cracked
you shouldn't have cracked
she shouldn't have cracked
we shouldn't have cracked
you shouldn't have cracked
they shouldn't have cracked	I shouldn't have been cracking
you shouldn't have been cracking
she shouldn't have been cracking
we shouldn't have been cracking
you shouldn't have been cracking
they shouldn't have been cracking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I crack?
should you crack?
should she crack?
should we crack?
should you crack?
should they crack? 	should I be cracking?
should you be cracking?
should she be cracking?
should we be cracking?
should you be cracking?
should they be cracking? 	should I have cracked?
should you have cracked?
should she have cracked?
should we have cracked?
should you have cracked?
should they have cracked? 	should I have been cracking?
should you have been cracking?
should she have been cracking?
should we have been cracking?
should you have been cracking?
should they have been cracking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I crack?
shouldn't you crack?
shouldn't she crack?
shouldn't we crack?
shouldn't you crack?
shouldn't they crack? 	shouldn't I be cracking?
shouldn't you be cracking?
shouldn't she be cracking?
shouldn't we be cracking?
shouldn't you be cracking?
shouldn't they be cracking? 	shouldn't I have cracked?
shouldn't you have cracked?
shouldn't she have cracked?
shouldn't we have cracked?
shouldn't you have cracked?
shouldn't they have cracked? 	shouldn't I have been cracking?
shouldn't you have been cracking?
shouldn't she have been cracking?
shouldn't we have been cracking?
shouldn't you have been cracking?
shouldn't they have been cracking?