English verb conjugation
CAN INVALIDATE

Regular verb: invalidate - invalidated - invalidated

Affirmation

Simple form	V-ing form
I can invalidate you can invalidate he can invalidate we can invalidate you can invalidate they can invalidate	I can be invalidating you can be invalidating he can be invalidating we can be invalidating you can be invalidating they can be invalidating
Perfect	V-ing perfect
I can have invalidated you can have invalidated he can have invalidated we can have invalidated you can have invalidated they can have invalidated	I can have been invalidating you can have been invalidating he can have been invalidating we can have been invalidating you can have been invalidating they can have been invalidating

Negation

Simple form	V-ing form
I can't invalidate you can't invalidate he can't invalidate we can't invalidate you can't invalidate they can't invalidate	I can't be invalidating you can't be invalidating he can't be invalidating we can't be invalidating you can't be invalidating they can't be invalidating
Perfect	V-ing perfect
I can't have invalidated you can't have invalidated he can't have invalidated we can't have invalidated you can't have invalidated they can't have invalidated	I can't have been invalidating you can't have been invalidating he can't have been invalidating we can't have been invalidating you can't have been invalidating they can't have been invalidating

Interrogative form

Simple form	V-ing form
can I invalidate? can you invalidate? can he invalidate? can we invalidate? can you invalidate? can they invalidate?	can I be invalidating? can you be invalidating? can he be invalidating? can we be invalidating? can you be invalidating? can they be invalidating?
Perfect	V-ing perfect
can I have invalidated? can you have invalidated? can he have invalidated? can we have invalidated? can you have invalidated? can they have invalidated?	can I have been invalidating? can you have been invalidating? can he have been invalidating? can we have been invalidating? can you have been invalidating? can they have been invalidating?

Interro-negative form

Simple form	V-ing form
can't I invalidate? can't you invalidate? can't he invalidate? can't we invalidate? can't you invalidate? can't they invalidate?	can't I be invalidating? can't you be invalidating? can't he be invalidating? can't we be invalidating? can't you be invalidating? can't they be invalidating?
Perfect	V-ing perfect
can't I have invalidated? can't you have invalidated? can't he have invalidated? can't we have invalidated? can't you have invalidated? can't they have invalidated?	can't I have been invalidating? can't you have been invalidating? can't he have been invalidating? can't we have been invalidating? can't you have been invalidating? can't they have been invalidating?