should sprain
Regular verb: sprain - sprained- sprained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd sprain
you'd sprain
she'd sprain
we'd sprain
you'd sprain
they'd sprain 	I'd be spraining
you'd be spraining
she'd be spraining
we'd be spraining
you'd be spraining
they'd be spraining	I should've sprained
you should've sprained
she should've sprained
we should've sprained
you should've sprained
they should've sprained	I should've been spraining
you should've been spraining
she should've been spraining
we should've been spraining
you should've been spraining
they should've been spraining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't sprain
you shouldn't sprain
she shouldn't sprain
we shouldn't sprain
you shouldn't sprain
they shouldn't sprain 	I shouldn't be spraining
you shouldn't be spraining
she shouldn't be spraining
we shouldn't be spraining
you shouldn't be spraining
they shouldn't be spraining	I shouldn't have sprained
you shouldn't have sprained
she shouldn't have sprained
we shouldn't have sprained
you shouldn't have sprained
they shouldn't have sprained	I shouldn't have been spraining
you shouldn't have been spraining
she shouldn't have been spraining
we shouldn't have been spraining
you shouldn't have been spraining
they shouldn't have been spraining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I sprain?
should you sprain?
should she sprain?
should we sprain?
should you sprain?
should they sprain? 	should I be spraining?
should you be spraining?
should she be spraining?
should we be spraining?
should you be spraining?
should they be spraining? 	should I have sprained?
should you have sprained?
should she have sprained?
should we have sprained?
should you have sprained?
should they have sprained? 	should I have been spraining?
should you have been spraining?
should she have been spraining?
should we have been spraining?
should you have been spraining?
should they have been spraining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I sprain?
shouldn't you sprain?
shouldn't she sprain?
shouldn't we sprain?
shouldn't you sprain?
shouldn't they sprain? 	shouldn't I be spraining?
shouldn't you be spraining?
shouldn't she be spraining?
shouldn't we be spraining?
shouldn't you be spraining?
shouldn't they be spraining? 	shouldn't I have sprained?
shouldn't you have sprained?
shouldn't she have sprained?
shouldn't we have sprained?
shouldn't you have sprained?
shouldn't they have sprained? 	shouldn't I have been spraining?
shouldn't you have been spraining?
shouldn't she have been spraining?
shouldn't we have been spraining?
shouldn't you have been spraining?
shouldn't they have been spraining?