English verb conjugation
COULD OXYGENATE

Regular verb: oxygenate - oxygenated - oxygenated

Affirmation

Simple form	V-ing form
I could oxygenate you could oxygenate he could oxygenate we could oxygenate you could oxygenate they could oxygenate	I could be oxygenating you could be oxygenating he could be oxygenating we could be oxygenating you could be oxygenating they could be oxygenating
Perfect	V-ing perfect
I could have oxygenated you could have oxygenated he could have oxygenated we could have oxygenated you could have oxygenated they could have oxygenated	I could have been oxygenating you could have been oxygenating he could have been oxygenating we could have been oxygenating you could have been oxygenating they could have been oxygenating

Negation

Simple form	V-ing form
I couldn't oxygenate you couldn't oxygenate he couldn't oxygenate we couldn't oxygenate you couldn't oxygenate they couldn't oxygenate	I couldn't be oxygenating you couldn't be oxygenating he couldn't be oxygenating we couldn't be oxygenating you couldn't be oxygenating they couldn't be oxygenating
Perfect	V-ing perfect
I couldn't have oxygenated you couldn't have oxygenated he couldn't have oxygenated we couldn't have oxygenated you couldn't have oxygenated they couldn't have oxygenated	I couldn't have been oxygenating you couldn't have been oxygenating he couldn't have been oxygenating we couldn't have been oxygenating you couldn't have been oxygenating they couldn't have been oxygenating

Interrogative form

Simple form	V-ing form
could I oxygenate? could you oxygenate? could he oxygenate? could we oxygenate? could you oxygenate? could they oxygenate?	could I be oxygenating? could you be oxygenating? could he be oxygenating? could we be oxygenating? could you be oxygenating? could they be oxygenating?
Perfect	V-ing perfect
could I have oxygenated? could you have oxygenated? could he have oxygenated? could we have oxygenated? could you have oxygenated? could they have oxygenated?	could I have been oxygenating? could you have been oxygenating? could he have been oxygenating? could we have been oxygenating? could you have been oxygenating? could they have been oxygenating?

Interro-negative form

Simple form	V-ing form
couldn't I oxygenate? couldn't you oxygenate? couldn't he oxygenate? couldn't we oxygenate? couldn't you oxygenate? couldn't they oxygenate?	couldn't I be oxygenating? couldn't you be oxygenating? couldn't he be oxygenating? couldn't we be oxygenating? couldn't you be oxygenating? couldn't they be oxygenating?
Perfect	V-ing perfect
couldn't I have oxygenated? couldn't you have oxygenated? couldn't he have oxygenated? couldn't we have oxygenated? couldn't you have oxygenated? couldn't they have oxygenated?	couldn't I have been oxygenating? couldn't you have been oxygenating? couldn't he have been oxygenating? couldn't we have been oxygenating? couldn't you have been oxygenating? couldn't they have been oxygenating?