English verb conjugation
SHOULD COMBUST

Regular verb: combust - combusted - combusted

Affirmation

Simple form	V-ing form
I'd combust you'd combust he'd combust we'd combust you'd combust they'd combust	I'd be combusting you'd be combusting he'd be combusting we'd be combusting you'd be combusting they'd be combusting
Perfect	V-ing perfect
I should've combusted you should've combusted he should've combusted we should've combusted you should've combusted they should've combusted	I should've been combusting you should've been combusting he should've been combusting we should've been combusting you should've been combusting they should've been combusting

Negation

Simple form	V-ing form
I shouldn't combust you shouldn't combust he shouldn't combust we shouldn't combust you shouldn't combust they shouldn't combust	I shouldn't be combusting you shouldn't be combusting he shouldn't be combusting we shouldn't be combusting you shouldn't be combusting they shouldn't be combusting
Perfect	V-ing perfect
I shouldn't have combusted you shouldn't have combusted he shouldn't have combusted we shouldn't have combusted you shouldn't have combusted they shouldn't have combusted	I shouldn't have been combusting you shouldn't have been combusting he shouldn't have been combusting we shouldn't have been combusting you shouldn't have been combusting they shouldn't have been combusting

Interrogative form

Simple form	V-ing form
should I combust? should you combust? should he combust? should we combust? should you combust? should they combust?	should I be combusting? should you be combusting? should he be combusting? should we be combusting? should you be combusting? should they be combusting?
Perfect	V-ing perfect
should I have combusted? should you have combusted? should he have combusted? should we have combusted? should you have combusted? should they have combusted?	should I have been combusting? should you have been combusting? should he have been combusting? should we have been combusting? should you have been combusting? should they have been combusting?

Interro-negative form

Simple form	V-ing form
shouldn't I combust? shouldn't you combust? shouldn't he combust? shouldn't we combust? shouldn't you combust? shouldn't they combust?	shouldn't I be combusting? shouldn't you be combusting? shouldn't he be combusting? shouldn't we be combusting? shouldn't you be combusting? shouldn't they be combusting?
Perfect	V-ing perfect
shouldn't I have combusted? shouldn't you have combusted? shouldn't he have combusted? shouldn't we have combusted? shouldn't you have combusted? shouldn't they have combusted?	shouldn't I have been combusting? shouldn't you have been combusting? shouldn't he have been combusting? shouldn't we have been combusting? shouldn't you have been combusting? shouldn't they have been combusting?