English verb conjugation
CAN COMBUST

Regular verb: combust - combusted - combusted

Affirmation

Simple form	V-ing form
I can combust you can combust she can combust we can combust you can combust they can combust	I can be combusting you can be combusting she can be combusting we can be combusting you can be combusting they can be combusting
Perfect	V-ing perfect
I can have combusted you can have combusted she can have combusted we can have combusted you can have combusted they can have combusted	I can have been combusting you can have been combusting she can have been combusting we can have been combusting you can have been combusting they can have been combusting

Negation

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

Interrogative form

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

Interro-negative form

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