ought to impair
Regular verb: impair - impaired- impaired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to impair
you ought to impair
he ought to impair
we ought to impair
you ought to impair
they ought to impair 	I ought to be impairing
you ought to be impairing
he ought to be impairing
we ought to be impairing
you ought to be impairing
they ought to be impairing	I ought to have impaired
you ought to have impaired
he ought to have impaired
we ought to have impaired
you ought to have impaired
they ought to have impaired	I ought to have been impairing
you ought to have been impairing
he ought to have been impairing
we ought to have been impairing
you ought to have been impairing
they ought to have been impairing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to impair
you ought not to impair
he ought not to impair
we ought not to impair
you ought not to impair
they ought not to impair 	I ought not to impairing
you ought not to impairing
he ought not to impairing
we ought not to impairing
you ought not to impairing
they ought not to impairing	I ought not to have impaired
you ought not to have impaired
he ought not to have impaired
we ought not to have impaired
you ought not to have impaired
they ought not to have impaired	I ought not to have been impairing
you ought not to have been impairing
he ought not to have been impairing
we ought not to have been impairing
you ought not to have been impairing
they ought not to have been impairing	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to impair?
ought you not to impair?
ought he not to impair?
ought we not to impair?
ought you not to impair?
ought they not to impair? 	ought I not to be impairing?
ought you not to be impairing?
ought he not to be impairing?
ought we not to be impairing?
ought you not to be impairing?
ought they not to be impairing? 	ought I not to have impaired?
ought you not to have impaired?
ought he not to have impaired?
ought we not to have impaired?
ought you not to have impaired?
ought they not to have impaired? 	ought I not to have been impairing?
ought you not to have been impairing?
ought he not to have been impairing?
ought we not to have been impairing?
ought you not to have been impairing?
ought they not to have been impairing?