may witness
Regular verb: witness - witnessed- witnessed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may witness
you may witness
he may witness
we may witness
you may witness
they may witness 	I may be witnessing
you may be witnessing
he may be witnessing
we may be witnessing
you may be witnessing
they may be witnessing	I may have witnessed
you may have witnessed
he may have witnessed
we may have witnessed
you may have witnessed
they may have witnessed	I may have been witnessing
you may have been witnessing
he may have been witnessing
we may have been witnessing
you may have been witnessing
they may have been witnessing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't witness
you mayn't witness
he mayn't witness
we mayn't witness
you mayn't witness
they mayn't witness 	I mayn't be witnessing
you mayn't be witnessing
he mayn't be witnessing
we mayn't be witnessing
you mayn't be witnessing
they mayn't be witnessing	I mayn't have witnessed
you mayn't have witnessed
he mayn't have witnessed
we mayn't have witnessed
you mayn't have witnessed
they mayn't have witnessed	I mayn't have been witnessing
you mayn't have been witnessing
he mayn't have been witnessing
we mayn't have been witnessing
you mayn't have been witnessing
they mayn't have been witnessing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I witness?
may you witness?
may he witness?
may we witness?
may you witness?
may they witness? 	may I be witnessing?
may you be witnessing?
may he be witnessing?
may we be witnessing?
may you be witnessing?
may they be witnessing? 	may I have witnessed?
may you have witnessed?
may he have witnessed?
may we have witnessed?
may you have witnessed?
may they have witnessed? 	may I have been witnessing?
may you have been witnessing?
may he have been witnessing?
may we have been witnessing?
may you have been witnessing?
may they have been witnessing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I witness?
mayn't you witness?
mayn't he witness?
mayn't we witness?
mayn't you witness?
mayn't they witness? 	mayn't I be witnessing?
mayn't you be witnessing?
mayn't he be witnessing?
mayn't we be witnessing?
mayn't you be witnessing?
mayn't they be witnessing? 	mayn't I have witnessed?
mayn't you have witnessed?
mayn't he have witnessed?
mayn't we have witnessed?
mayn't you have witnessed?
mayn't they have witnessed? 	mayn't I have been witnessing?
mayn't you have been witnessing?
mayn't he have been witnessing?
mayn't we have been witnessing?
mayn't you have been witnessing?
mayn't they have been witnessing?