English verb conjugation
COULD VAPOR

Regular verb: vapor - vapored - vapored

Affirmation

Simple form	V-ing form
I could vapor you could vapor he could vapor we could vapor you could vapor they could vapor	I could be vaporing you could be vaporing he could be vaporing we could be vaporing you could be vaporing they could be vaporing
Perfect	V-ing perfect
I could have vapored you could have vapored he could have vapored we could have vapored you could have vapored they could have vapored	I could have been vaporing you could have been vaporing he could have been vaporing we could have been vaporing you could have been vaporing they could have been vaporing

Negation

Simple form	V-ing form
I couldn't vapor you couldn't vapor he couldn't vapor we couldn't vapor you couldn't vapor they couldn't vapor	I couldn't be vaporing you couldn't be vaporing he couldn't be vaporing we couldn't be vaporing you couldn't be vaporing they couldn't be vaporing
Perfect	V-ing perfect
I couldn't have vapored you couldn't have vapored he couldn't have vapored we couldn't have vapored you couldn't have vapored they couldn't have vapored	I couldn't have been vaporing you couldn't have been vaporing he couldn't have been vaporing we couldn't have been vaporing you couldn't have been vaporing they couldn't have been vaporing

Interrogative form

Simple form	V-ing form
could I vapor? could you vapor? could he vapor? could we vapor? could you vapor? could they vapor?	could I be vaporing? could you be vaporing? could he be vaporing? could we be vaporing? could you be vaporing? could they be vaporing?
Perfect	V-ing perfect
could I have vapored? could you have vapored? could he have vapored? could we have vapored? could you have vapored? could they have vapored?	could I have been vaporing? could you have been vaporing? could he have been vaporing? could we have been vaporing? could you have been vaporing? could they have been vaporing?

Interro-negative form

Simple form	V-ing form
couldn't I vapor? couldn't you vapor? couldn't he vapor? couldn't we vapor? couldn't you vapor? couldn't they vapor?	couldn't I be vaporing? couldn't you be vaporing? couldn't he be vaporing? couldn't we be vaporing? couldn't you be vaporing? couldn't they be vaporing?
Perfect	V-ing perfect
couldn't I have vapored? couldn't you have vapored? couldn't he have vapored? couldn't we have vapored? couldn't you have vapored? couldn't they have vapored?	couldn't I have been vaporing? couldn't you have been vaporing? couldn't he have been vaporing? couldn't we have been vaporing? couldn't you have been vaporing? couldn't they have been vaporing?