should trephine
Regular verb: trephine - trephined- trephined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd trephine
you'd trephine
he'd trephine
we'd trephine
you'd trephine
they'd trephine 	I'd be trephining
you'd be trephining
he'd be trephining
we'd be trephining
you'd be trephining
they'd be trephining	I should've trephined
you should've trephined
he should've trephined
we should've trephined
you should've trephined
they should've trephined	I should've been trephining
you should've been trephining
he should've been trephining
we should've been trephining
you should've been trephining
they should've been trephining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't trephine
you shouldn't trephine
he shouldn't trephine
we shouldn't trephine
you shouldn't trephine
they shouldn't trephine 	I shouldn't be trephining
you shouldn't be trephining
he shouldn't be trephining
we shouldn't be trephining
you shouldn't be trephining
they shouldn't be trephining	I shouldn't have trephined
you shouldn't have trephined
he shouldn't have trephined
we shouldn't have trephined
you shouldn't have trephined
they shouldn't have trephined	I shouldn't have been trephining
you shouldn't have been trephining
he shouldn't have been trephining
we shouldn't have been trephining
you shouldn't have been trephining
they shouldn't have been trephining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I trephine?
should you trephine?
should he trephine?
should we trephine?
should you trephine?
should they trephine? 	should I be trephining?
should you be trephining?
should he be trephining?
should we be trephining?
should you be trephining?
should they be trephining? 	should I have trephined?
should you have trephined?
should he have trephined?
should we have trephined?
should you have trephined?
should they have trephined? 	should I have been trephining?
should you have been trephining?
should he have been trephining?
should we have been trephining?
should you have been trephining?
should they have been trephining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I trephine?
shouldn't you trephine?
shouldn't he trephine?
shouldn't we trephine?
shouldn't you trephine?
shouldn't they trephine? 	shouldn't I be trephining?
shouldn't you be trephining?
shouldn't he be trephining?
shouldn't we be trephining?
shouldn't you be trephining?
shouldn't they be trephining? 	shouldn't I have trephined?
shouldn't you have trephined?
shouldn't he have trephined?
shouldn't we have trephined?
shouldn't you have trephined?
shouldn't they have trephined? 	shouldn't I have been trephining?
shouldn't you have been trephining?
shouldn't he have been trephining?
shouldn't we have been trephining?
shouldn't you have been trephining?
shouldn't they have been trephining?