English verb conjugation
COULD SURTAX

Regular verb: surtax - surtaxed - surtaxed

Affirmation

Simple form	V-ing form
I could surtax you could surtax he could surtax we could surtax you could surtax they could surtax	I could be surtaxing you could be surtaxing he 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 he 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 he 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 couldn't surtax you couldn't surtax he couldn't surtax we couldn't surtax you couldn't surtax they couldn't surtax	I couldn't be surtaxing you couldn't be surtaxing he couldn't be surtaxing we couldn't be surtaxing you couldn't be surtaxing they couldn't be surtaxing
Perfect	V-ing perfect
I couldn't have surtaxed you couldn't have surtaxed he couldn't have surtaxed we couldn't have surtaxed you couldn't have surtaxed they couldn't have surtaxed	I couldn't have been surtaxing you couldn't have been surtaxing he couldn't have been surtaxing we couldn't have been surtaxing you couldn't have been surtaxing they couldn't have been surtaxing

Interrogative form

Simple form	V-ing form
could I surtax? could you surtax? could he surtax? could we surtax? could you surtax? could they surtax?	could I be surtaxing? could you be surtaxing? could he 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 he 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 he 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
couldn't I surtax? couldn't you surtax? couldn't he surtax? couldn't we surtax? couldn't you surtax? couldn't they surtax?	couldn't I be surtaxing? couldn't you be surtaxing? couldn't he be surtaxing? couldn't we be surtaxing? couldn't you be surtaxing? couldn't they be surtaxing?
Perfect	V-ing perfect
couldn't I have surtaxed? couldn't you have surtaxed? couldn't he have surtaxed? couldn't we have surtaxed? couldn't you have surtaxed? couldn't they have surtaxed?	couldn't I have been surtaxing? couldn't you have been surtaxing? couldn't he have been surtaxing? couldn't we have been surtaxing? couldn't you have been surtaxing? couldn't they have been surtaxing?