may invalidate
Regular verb: invalidate - invalidated- invalidated

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not invalidate
you may not invalidate
he may not invalidate
we may not invalidate
you may not invalidate
they may not invalidate 	I may not be invalidating
you may not be invalidating
he may not be invalidating
we may not be invalidating
you may not be invalidating
they may not be invalidating	I may not have invalidated
you may not have invalidated
he may not have invalidated
we may not have invalidated
you may not have invalidated
they may not have invalidated	I may not have been invalidating
you may not have been invalidating
he may not have been invalidating
we may not have been invalidating
you may not have been invalidating
they may not have been invalidating	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not invalidate?
may you not invalidate?
may he not invalidate?
may we not invalidate?
may you not invalidate?
may they not invalidate? 	may I not be invalidating?
may you not be invalidating?
may he not be invalidating?
may we not be invalidating?
may you not be invalidating?
may they not be invalidating? 	may I not have invalidated?
may you not have invalidated?
may he not have invalidated?
may we not have invalidated?
may you not have invalidated?
may they not have invalidated? 	may I not have been invalidating?
may you not have been invalidating?
may he not have been invalidating?
may we not have been invalidating?
may you not have been invalidating?
may they not have been invalidating?