can invalidate
Verbo regular: invalidate - invalidated- invalidated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	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?