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 couldn't sweeten you couldn't sweeten she couldn't sweeten we couldn't sweeten you couldn't sweeten they couldn't sweeten	I couldn't be sweetening you couldn't be sweetening she couldn't be sweetening we couldn't be sweetening you couldn't be sweetening they couldn't be sweetening
Perfect	V-ing perfect
I couldn't have sweetened you couldn't have sweetened she couldn't have sweetened we couldn't have sweetened you couldn't have sweetened they couldn't have sweetened	I couldn't have been sweetening you couldn't have been sweetening she couldn't have been sweetening we couldn't have been sweetening you couldn't have been sweetening they couldn't 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
couldn't I sweeten? couldn't you sweeten? couldn't she sweeten? couldn't we sweeten? couldn't you sweeten? couldn't they sweeten?	couldn't I be sweetening? couldn't you be sweetening? couldn't she be sweetening? couldn't we be sweetening? couldn't you be sweetening? couldn't they be sweetening?
Perfect	V-ing perfect
couldn't I have sweetened? couldn't you have sweetened? couldn't she have sweetened? couldn't we have sweetened? couldn't you have sweetened? couldn't they have sweetened?	couldn't I have been sweetening? couldn't you have been sweetening? couldn't she have been sweetening? couldn't we have been sweetening? couldn't you have been sweetening? couldn't they have been sweetening?