English verb conjugation
CAN IMPAIR

Regular verb: impair - impaired - impaired

Affirmation

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

Negation

Simple form	V-ing form
I cannot impair you cannot impair he cannot impair we cannot impair you cannot impair they cannot impair	I cannot be impairing you cannot be impairing he cannot be impairing we cannot be impairing you cannot be impairing they cannot be impairing
Perfect	V-ing perfect
I cannot have impaired you cannot have impaired he cannot have impaired we cannot have impaired you cannot have impaired they cannot have impaired	I cannot have been impairing you cannot have been impairing he cannot have been impairing we cannot have been impairing you cannot have been impairing they cannot have been impairing

Interrogative form

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

Interro-negative form

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