English verb conjugation
COULD HYDROGENATE

Regular verb: hydrogenate - hydrogenated - hydrogenated

Affirmation

Simple form	V-ing form
I could hydrogenate you could hydrogenate he could hydrogenate we could hydrogenate you could hydrogenate they could hydrogenate	I could be hydrogenating you could be hydrogenating he could be hydrogenating we could be hydrogenating you could be hydrogenating they could be hydrogenating
Perfect	V-ing perfect
I could have hydrogenated you could have hydrogenated he could have hydrogenated we could have hydrogenated you could have hydrogenated they could have hydrogenated	I could have been hydrogenating you could have been hydrogenating he could have been hydrogenating we could have been hydrogenating you could have been hydrogenating they could have been hydrogenating

Negation

Simple form	V-ing form
I couldn't hydrogenate you couldn't hydrogenate he couldn't hydrogenate we couldn't hydrogenate you couldn't hydrogenate they couldn't hydrogenate	I couldn't be hydrogenating you couldn't be hydrogenating he couldn't be hydrogenating we couldn't be hydrogenating you couldn't be hydrogenating they couldn't be hydrogenating
Perfect	V-ing perfect
I couldn't have hydrogenated you couldn't have hydrogenated he couldn't have hydrogenated we couldn't have hydrogenated you couldn't have hydrogenated they couldn't have hydrogenated	I couldn't have been hydrogenating you couldn't have been hydrogenating he couldn't have been hydrogenating we couldn't have been hydrogenating you couldn't have been hydrogenating they couldn't have been hydrogenating

Interrogative form

Simple form	V-ing form
could I hydrogenate? could you hydrogenate? could he hydrogenate? could we hydrogenate? could you hydrogenate? could they hydrogenate?	could I be hydrogenating? could you be hydrogenating? could he be hydrogenating? could we be hydrogenating? could you be hydrogenating? could they be hydrogenating?
Perfect	V-ing perfect
could I have hydrogenated? could you have hydrogenated? could he have hydrogenated? could we have hydrogenated? could you have hydrogenated? could they have hydrogenated?	could I have been hydrogenating? could you have been hydrogenating? could he have been hydrogenating? could we have been hydrogenating? could you have been hydrogenating? could they have been hydrogenating?

Interro-negative form

Simple form	V-ing form
couldn't I hydrogenate? couldn't you hydrogenate? couldn't he hydrogenate? couldn't we hydrogenate? couldn't you hydrogenate? couldn't they hydrogenate?	couldn't I be hydrogenating? couldn't you be hydrogenating? couldn't he be hydrogenating? couldn't we be hydrogenating? couldn't you be hydrogenating? couldn't they be hydrogenating?
Perfect	V-ing perfect
couldn't I have hydrogenated? couldn't you have hydrogenated? couldn't he have hydrogenated? couldn't we have hydrogenated? couldn't you have hydrogenated? couldn't they have hydrogenated?	couldn't I have been hydrogenating? couldn't you have been hydrogenating? couldn't he have been hydrogenating? couldn't we have been hydrogenating? couldn't you have been hydrogenating? couldn't they have been hydrogenating?