should impair
Regular verb: impair - impaired- impaired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd impair
you'd impair
he'd impair
we'd impair
you'd impair
they'd impair 	I'd be impairing
you'd be impairing
he'd be impairing
we'd be impairing
you'd be impairing
they'd be impairing	I should've impaired
you should've impaired
he should've impaired
we should've impaired
you should've impaired
they should've impaired	I should've been impairing
you should've been impairing
he should've been impairing
we should've been impairing
you should've been impairing
they should've been impairing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't impair
you shouldn't impair
he shouldn't impair
we shouldn't impair
you shouldn't impair
they shouldn't impair 	I shouldn't be impairing
you shouldn't be impairing
he shouldn't be impairing
we shouldn't be impairing
you shouldn't be impairing
they shouldn't be impairing	I shouldn't have impaired
you shouldn't have impaired
he shouldn't have impaired
we shouldn't have impaired
you shouldn't have impaired
they shouldn't have impaired	I shouldn't have been impairing
you shouldn't have been impairing
he shouldn't have been impairing
we shouldn't have been impairing
you shouldn't have been impairing
they shouldn't have been impairing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I impair?
should you impair?
should he impair?
should we impair?
should you impair?
should they impair? 	should I be impairing?
should you be impairing?
should he be impairing?
should we be impairing?
should you be impairing?
should they be impairing? 	should I have impaired?
should you have impaired?
should he have impaired?
should we have impaired?
should you have impaired?
should they have impaired? 	should I have been impairing?
should you have been impairing?
should he have been impairing?
should we have been impairing?
should you have been impairing?
should they have been impairing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I impair?
shouldn't you impair?
shouldn't he impair?
shouldn't we impair?
shouldn't you impair?
shouldn't they impair? 	shouldn't I be impairing?
shouldn't you be impairing?
shouldn't he be impairing?
shouldn't we be impairing?
shouldn't you be impairing?
shouldn't they be impairing? 	shouldn't I have impaired?
shouldn't you have impaired?
shouldn't he have impaired?
shouldn't we have impaired?
shouldn't you have impaired?
shouldn't they have impaired? 	shouldn't I have been impairing?
shouldn't you have been impairing?
shouldn't he have been impairing?
shouldn't we have been impairing?
shouldn't you have been impairing?
shouldn't they have been impairing?