may impugn
Regular verb: impugn - impugned- impugned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may impugn
you may impugn
he may impugn
we may impugn
you may impugn
they may impugn 	I may be impugning
you may be impugning
he may be impugning
we may be impugning
you may be impugning
they may be impugning	I may have impugned
you may have impugned
he may have impugned
we may have impugned
you may have impugned
they may have impugned	I may have been impugning
you may have been impugning
he may have been impugning
we may have been impugning
you may have been impugning
they may have been impugning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't impugn
you mayn't impugn
he mayn't impugn
we mayn't impugn
you mayn't impugn
they mayn't impugn 	I mayn't be impugning
you mayn't be impugning
he mayn't be impugning
we mayn't be impugning
you mayn't be impugning
they mayn't be impugning	I mayn't have impugned
you mayn't have impugned
he mayn't have impugned
we mayn't have impugned
you mayn't have impugned
they mayn't have impugned	I mayn't have been impugning
you mayn't have been impugning
he mayn't have been impugning
we mayn't have been impugning
you mayn't have been impugning
they mayn't have been impugning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I impugn?
may you impugn?
may he impugn?
may we impugn?
may you impugn?
may they impugn? 	may I be impugning?
may you be impugning?
may he be impugning?
may we be impugning?
may you be impugning?
may they be impugning? 	may I have impugned?
may you have impugned?
may he have impugned?
may we have impugned?
may you have impugned?
may they have impugned? 	may I have been impugning?
may you have been impugning?
may he have been impugning?
may we have been impugning?
may you have been impugning?
may they have been impugning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I impugn?
mayn't you impugn?
mayn't he impugn?
mayn't we impugn?
mayn't you impugn?
mayn't they impugn? 	mayn't I be impugning?
mayn't you be impugning?
mayn't he be impugning?
mayn't we be impugning?
mayn't you be impugning?
mayn't they be impugning? 	mayn't I have impugned?
mayn't you have impugned?
mayn't he have impugned?
mayn't we have impugned?
mayn't you have impugned?
mayn't they have impugned? 	mayn't I have been impugning?
mayn't you have been impugning?
mayn't he have been impugning?
mayn't we have been impugning?
mayn't you have been impugning?
mayn't they have been impugning?