English verb conjugation
CAN COMBUST

Regular verb: combust - combusted - combusted

Affirmation

Simple form	V-ing form
I can combust you can combust he can combust we can combust you can combust they can combust	I can be combusting you can be combusting he 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 he 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 he 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 he 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 he 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 he 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 he 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 he combust? can we combust? can you combust? can they combust?	can I be combusting? can you be combusting? can he 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 he 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 he 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 he 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 he 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 he 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 he have been combusting? can't we have been combusting? can't you have been combusting? can't they have been combusting?