English verb conjugation
COULD SUCCUMB

Regular verb: succumb - succumbed - succumbed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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