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 can't impair you can't impair he can't impair we can't impair you can't impair they can't impair	I can't be impairing you can't be impairing he can't be impairing we can't be impairing you can't be impairing they can't be impairing
Perfect	V-ing perfect
I can't have impaired you can't have impaired he can't have impaired we can't have impaired you can't have impaired they can't have impaired	I can't have been impairing you can't have been impairing he can't have been impairing we can't have been impairing you can't have been impairing they can't 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't I impair? can't you impair? can't he impair? can't we impair? can't you impair? can't they impair?	can't I be impairing? can't you be impairing? can't he be impairing? can't we be impairing? can't you be impairing? can't they be impairing?
Perfect	V-ing perfect
can't I have impaired? can't you have impaired? can't he have impaired? can't we have impaired? can't you have impaired? can't they have impaired?	can't I have been impairing? can't you have been impairing? can't he have been impairing? can't we have been impairing? can't you have been impairing? can't they have been impairing?