I'd be combating you'd be combating he'd be combating we'd be combating you'd be combating they'd be combating
Perfect
I should've combated you should've combated he should've combated we should've combated you should've combated they should've combated
V-ing perfect
I should've been combating you should've been combating he should've been combating we should've been combating you should've been combating they should've been combating
Negation
Simple form
I shouldn't combat you shouldn't combat he shouldn't combat we shouldn't combat you shouldn't combat they shouldn't combat
V-ing form
I shouldn't be combating you shouldn't be combating he shouldn't be combating we shouldn't be combating you shouldn't be combating they shouldn't be combating
Perfect
I shouldn't have combated you shouldn't have combated he shouldn't have combated we shouldn't have combated you shouldn't have combated they shouldn't have combated
V-ing perfect
I shouldn't have been combating you shouldn't have been combating he shouldn't have been combating we shouldn't have been combating you shouldn't have been combating they shouldn't have been combating
Interrogative form
Simple form
should I combat? should you combat? should he combat? should we combat? should you combat? should they combat?
V-ing form
should I be combating? should you be combating? should he be combating? should we be combating? should you be combating? should they be combating?
Perfect
should I have combated? should you have combated? should he have combated? should we have combated? should you have combated? should they have combated?
V-ing perfect
should I have been combating? should you have been combating? should he have been combating? should we have been combating? should you have been combating? should they have been combating?
Interro-negative form
Simple form
shouldn't I combat? shouldn't you combat? shouldn't he combat? shouldn't we combat? shouldn't you combat? shouldn't they combat?
V-ing form
shouldn't I be combating? shouldn't you be combating? shouldn't he be combating? shouldn't we be combating? shouldn't you be combating? shouldn't they be combating?
Perfect
shouldn't I have combated? shouldn't you have combated? shouldn't he have combated? shouldn't we have combated? shouldn't you have combated? shouldn't they have combated?
V-ing perfect
shouldn't I have been combating? shouldn't you have been combating? shouldn't he have been combating? shouldn't we have been combating? shouldn't you have been combating? shouldn't they have been combating?