should croak
Regular verb: croak - croaked- croaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd croak
you'd croak
she'd croak
we'd croak
you'd croak
they'd croak 	I'd be croaking
you'd be croaking
she'd be croaking
we'd be croaking
you'd be croaking
they'd be croaking	I should've croaked
you should've croaked
she should've croaked
we should've croaked
you should've croaked
they should've croaked	I should've been croaking
you should've been croaking
she should've been croaking
we should've been croaking
you should've been croaking
they should've been croaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't croak
you shouldn't croak
she shouldn't croak
we shouldn't croak
you shouldn't croak
they shouldn't croak 	I shouldn't be croaking
you shouldn't be croaking
she shouldn't be croaking
we shouldn't be croaking
you shouldn't be croaking
they shouldn't be croaking	I shouldn't have croaked
you shouldn't have croaked
she shouldn't have croaked
we shouldn't have croaked
you shouldn't have croaked
they shouldn't have croaked	I shouldn't have been croaking
you shouldn't have been croaking
she shouldn't have been croaking
we shouldn't have been croaking
you shouldn't have been croaking
they shouldn't have been croaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I croak?
should you croak?
should she croak?
should we croak?
should you croak?
should they croak? 	should I be croaking?
should you be croaking?
should she be croaking?
should we be croaking?
should you be croaking?
should they be croaking? 	should I have croaked?
should you have croaked?
should she have croaked?
should we have croaked?
should you have croaked?
should they have croaked? 	should I have been croaking?
should you have been croaking?
should she have been croaking?
should we have been croaking?
should you have been croaking?
should they have been croaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I croak?
shouldn't you croak?
shouldn't she croak?
shouldn't we croak?
shouldn't you croak?
shouldn't they croak? 	shouldn't I be croaking?
shouldn't you be croaking?
shouldn't she be croaking?
shouldn't we be croaking?
shouldn't you be croaking?
shouldn't they be croaking? 	shouldn't I have croaked?
shouldn't you have croaked?
shouldn't she have croaked?
shouldn't we have croaked?
shouldn't you have croaked?
shouldn't they have croaked? 	shouldn't I have been croaking?
shouldn't you have been croaking?
shouldn't she have been croaking?
shouldn't we have been croaking?
shouldn't you have been croaking?
shouldn't they have been croaking?