English verb conjugation
COULD DEUTERATE

Regular verb: deuterate - deuterated - deuterated

Affirmation

Simple form	V-ing form
I could deuterate you could deuterate he could deuterate we could deuterate you could deuterate they could deuterate	I could be deuterating you could be deuterating he could be deuterating we could be deuterating you could be deuterating they could be deuterating
Perfect	V-ing perfect
I could have deuterated you could have deuterated he could have deuterated we could have deuterated you could have deuterated they could have deuterated	I could have been deuterating you could have been deuterating he could have been deuterating we could have been deuterating you could have been deuterating they could have been deuterating

Negation

Simple form	V-ing form
I couldn't deuterate you couldn't deuterate he couldn't deuterate we couldn't deuterate you couldn't deuterate they couldn't deuterate	I couldn't be deuterating you couldn't be deuterating he couldn't be deuterating we couldn't be deuterating you couldn't be deuterating they couldn't be deuterating
Perfect	V-ing perfect
I couldn't have deuterated you couldn't have deuterated he couldn't have deuterated we couldn't have deuterated you couldn't have deuterated they couldn't have deuterated	I couldn't have been deuterating you couldn't have been deuterating he couldn't have been deuterating we couldn't have been deuterating you couldn't have been deuterating they couldn't have been deuterating

Interrogative form

Simple form	V-ing form
could I deuterate? could you deuterate? could he deuterate? could we deuterate? could you deuterate? could they deuterate?	could I be deuterating? could you be deuterating? could he be deuterating? could we be deuterating? could you be deuterating? could they be deuterating?
Perfect	V-ing perfect
could I have deuterated? could you have deuterated? could he have deuterated? could we have deuterated? could you have deuterated? could they have deuterated?	could I have been deuterating? could you have been deuterating? could he have been deuterating? could we have been deuterating? could you have been deuterating? could they have been deuterating?

Interro-negative form

Simple form	V-ing form
couldn't I deuterate? couldn't you deuterate? couldn't he deuterate? couldn't we deuterate? couldn't you deuterate? couldn't they deuterate?	couldn't I be deuterating? couldn't you be deuterating? couldn't he be deuterating? couldn't we be deuterating? couldn't you be deuterating? couldn't they be deuterating?
Perfect	V-ing perfect
couldn't I have deuterated? couldn't you have deuterated? couldn't he have deuterated? couldn't we have deuterated? couldn't you have deuterated? couldn't they have deuterated?	couldn't I have been deuterating? couldn't you have been deuterating? couldn't he have been deuterating? couldn't we have been deuterating? couldn't you have been deuterating? couldn't they have been deuterating?