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 cannot combust you cannot combust he cannot combust we cannot combust you cannot combust they cannot combust	I cannot be combusting you cannot be combusting he cannot be combusting we cannot be combusting you cannot be combusting they cannot be combusting
Perfect	V-ing perfect
I cannot have combusted you cannot have combusted he cannot have combusted we cannot have combusted you cannot have combusted they cannot have combusted	I cannot have been combusting you cannot have been combusting he cannot have been combusting we cannot have been combusting you cannot have been combusting they cannot 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 I not combust? can you not combust? can he not combust? can we not combust? can you not combust? can they not combust?	can I not be combusting? can you not be combusting? can he not be combusting? can we not be combusting? can you not be combusting? can they not be combusting?
Perfect	V-ing perfect
can I not have combusted? can you not have combusted? can he not have combusted? can we not have combusted? can you not have combusted? can they not have combusted?	can I not have been combusting? can you not have been combusting? can he not have been combusting? can we not have been combusting? can you not have been combusting? can they not have been combusting?