English verb conjugation
COULD SWEETEN

Regular verb: sweeten - sweetened - sweetened

Affirmation

Simple form	V-ing form
I could sweeten you could sweeten she could sweeten we could sweeten you could sweeten they could sweeten	I could be sweetening you could be sweetening she could be sweetening we could be sweetening you could be sweetening they could be sweetening
Perfect	V-ing perfect
I could have sweetened you could have sweetened she could have sweetened we could have sweetened you could have sweetened they could have sweetened	I could have been sweetening you could have been sweetening she could have been sweetening we could have been sweetening you could have been sweetening they could have been sweetening

Negation

Simple form	V-ing form
I could not sweeten you could not sweeten she could not sweeten we could not sweeten you could not sweeten they could not sweeten	I could not be sweetening you could not be sweetening she could not be sweetening we could not be sweetening you could not be sweetening they could not be sweetening
Perfect	V-ing perfect
I could not have sweetened you could not have sweetened she could not have sweetened we could not have sweetened you could not have sweetened they could not have sweetened	I could not have been sweetening you could not have been sweetening she could not have been sweetening we could not have been sweetening you could not have been sweetening they could not have been sweetening

Interrogative form

Simple form	V-ing form
could I sweeten? could you sweeten? could she sweeten? could we sweeten? could you sweeten? could they sweeten?	could I be sweetening? could you be sweetening? could she be sweetening? could we be sweetening? could you be sweetening? could they be sweetening?
Perfect	V-ing perfect
could I have sweetened? could you have sweetened? could she have sweetened? could we have sweetened? could you have sweetened? could they have sweetened?	could I have been sweetening? could you have been sweetening? could she have been sweetening? could we have been sweetening? could you have been sweetening? could they have been sweetening?

Interro-negative form

Simple form	V-ing form
could I not sweeten? could you not sweeten? could she not sweeten? could we not sweeten? could you not sweeten? could they not sweeten?	could I not be sweetening? could you not be sweetening? could she not be sweetening? could we not be sweetening? could you not be sweetening? could they not be sweetening?
Perfect	V-ing perfect
could I not have sweetened? could you not have sweetened? could she not have sweetened? could we not have sweetened? could you not have sweetened? could they not have sweetened?	could I not have been sweetening? could you not have been sweetening? could she not have been sweetening? could we not have been sweetening? could you not have been sweetening? could they not have been sweetening?