may succumb
Regular verb: succumb - succumbed- succumbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may succumb
you may succumb
he may succumb
we may succumb
you may succumb
they may succumb 	I may be succumbing
you may be succumbing
he may be succumbing
we may be succumbing
you may be succumbing
they may be succumbing	I may have succumbed
you may have succumbed
he may have succumbed
we may have succumbed
you may have succumbed
they may have succumbed	I may have been succumbing
you may have been succumbing
he may have been succumbing
we may have been succumbing
you may have been succumbing
they may have been succumbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't succumb
you mayn't succumb
he mayn't succumb
we mayn't succumb
you mayn't succumb
they mayn't succumb 	I mayn't be succumbing
you mayn't be succumbing
he mayn't be succumbing
we mayn't be succumbing
you mayn't be succumbing
they mayn't be succumbing	I mayn't have succumbed
you mayn't have succumbed
he mayn't have succumbed
we mayn't have succumbed
you mayn't have succumbed
they mayn't have succumbed	I mayn't have been succumbing
you mayn't have been succumbing
he mayn't have been succumbing
we mayn't have been succumbing
you mayn't have been succumbing
they mayn't have been succumbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I succumb?
may you succumb?
may he succumb?
may we succumb?
may you succumb?
may they succumb? 	may I be succumbing?
may you be succumbing?
may he be succumbing?
may we be succumbing?
may you be succumbing?
may they be succumbing? 	may I have succumbed?
may you have succumbed?
may he have succumbed?
may we have succumbed?
may you have succumbed?
may they have succumbed? 	may I have been succumbing?
may you have been succumbing?
may he have been succumbing?
may we have been succumbing?
may you have been succumbing?
may they have been succumbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I succumb?
mayn't you succumb?
mayn't he succumb?
mayn't we succumb?
mayn't you succumb?
mayn't they succumb? 	mayn't I be succumbing?
mayn't you be succumbing?
mayn't he be succumbing?
mayn't we be succumbing?
mayn't you be succumbing?
mayn't they be succumbing? 	mayn't I have succumbed?
mayn't you have succumbed?
mayn't he have succumbed?
mayn't we have succumbed?
mayn't you have succumbed?
mayn't they have succumbed? 	mayn't I have been succumbing?
mayn't you have been succumbing?
mayn't he have been succumbing?
mayn't we have been succumbing?
mayn't you have been succumbing?
mayn't they have been succumbing?