English verb conjugation
COULD SURTAX

Regular verb: surtax - surtaxed - surtaxed

Affirmation

Simple form	V-ing form
I could surtax you could surtax she could surtax we could surtax you could surtax they could surtax	I could be surtaxing you could be surtaxing she could be surtaxing we could be surtaxing you could be surtaxing they could be surtaxing
Perfect	V-ing perfect
I could have surtaxed you could have surtaxed she could have surtaxed we could have surtaxed you could have surtaxed they could have surtaxed	I could have been surtaxing you could have been surtaxing she could have been surtaxing we could have been surtaxing you could have been surtaxing they could have been surtaxing

Negation

Simple form	V-ing form
I could not surtax you could not surtax she could not surtax we could not surtax you could not surtax they could not surtax	I could not be surtaxing you could not be surtaxing she could not be surtaxing we could not be surtaxing you could not be surtaxing they could not be surtaxing
Perfect	V-ing perfect
I could not have surtaxed you could not have surtaxed she could not have surtaxed we could not have surtaxed you could not have surtaxed they could not have surtaxed	I could not have been surtaxing you could not have been surtaxing she could not have been surtaxing we could not have been surtaxing you could not have been surtaxing they could not have been surtaxing

Interrogative form

Simple form	V-ing form
could I surtax? could you surtax? could she surtax? could we surtax? could you surtax? could they surtax?	could I be surtaxing? could you be surtaxing? could she be surtaxing? could we be surtaxing? could you be surtaxing? could they be surtaxing?
Perfect	V-ing perfect
could I have surtaxed? could you have surtaxed? could she have surtaxed? could we have surtaxed? could you have surtaxed? could they have surtaxed?	could I have been surtaxing? could you have been surtaxing? could she have been surtaxing? could we have been surtaxing? could you have been surtaxing? could they have been surtaxing?

Interro-negative form

Simple form	V-ing form
could I not surtax? could you not surtax? could she not surtax? could we not surtax? could you not surtax? could they not surtax?	could I not be surtaxing? could you not be surtaxing? could she not be surtaxing? could we not be surtaxing? could you not be surtaxing? could they not be surtaxing?
Perfect	V-ing perfect
could I not have surtaxed? could you not have surtaxed? could she not have surtaxed? could we not have surtaxed? could you not have surtaxed? could they not have surtaxed?	could I not have been surtaxing? could you not have been surtaxing? could she not have been surtaxing? could we not have been surtaxing? could you not have been surtaxing? could they not have been surtaxing?