English verb conjugation
COULD NITRATE

Regular verb: nitrate - nitrated - nitrated

Affirmation

Simple form	V-ing form
I could nitrate you could nitrate he could nitrate we could nitrate you could nitrate they could nitrate	I could be nitrating you could be nitrating he could be nitrating we could be nitrating you could be nitrating they could be nitrating
Perfect	V-ing perfect
I could have nitrated you could have nitrated he could have nitrated we could have nitrated you could have nitrated they could have nitrated	I could have been nitrating you could have been nitrating he could have been nitrating we could have been nitrating you could have been nitrating they could have been nitrating

Negation

Simple form	V-ing form
I couldn't nitrate you couldn't nitrate he couldn't nitrate we couldn't nitrate you couldn't nitrate they couldn't nitrate	I couldn't be nitrating you couldn't be nitrating he couldn't be nitrating we couldn't be nitrating you couldn't be nitrating they couldn't be nitrating
Perfect	V-ing perfect
I couldn't have nitrated you couldn't have nitrated he couldn't have nitrated we couldn't have nitrated you couldn't have nitrated they couldn't have nitrated	I couldn't have been nitrating you couldn't have been nitrating he couldn't have been nitrating we couldn't have been nitrating you couldn't have been nitrating they couldn't have been nitrating

Interrogative form

Simple form	V-ing form
could I nitrate? could you nitrate? could he nitrate? could we nitrate? could you nitrate? could they nitrate?	could I be nitrating? could you be nitrating? could he be nitrating? could we be nitrating? could you be nitrating? could they be nitrating?
Perfect	V-ing perfect
could I have nitrated? could you have nitrated? could he have nitrated? could we have nitrated? could you have nitrated? could they have nitrated?	could I have been nitrating? could you have been nitrating? could he have been nitrating? could we have been nitrating? could you have been nitrating? could they have been nitrating?

Interro-negative form

Simple form	V-ing form
couldn't I nitrate? couldn't you nitrate? couldn't he nitrate? couldn't we nitrate? couldn't you nitrate? couldn't they nitrate?	couldn't I be nitrating? couldn't you be nitrating? couldn't he be nitrating? couldn't we be nitrating? couldn't you be nitrating? couldn't they be nitrating?
Perfect	V-ing perfect
couldn't I have nitrated? couldn't you have nitrated? couldn't he have nitrated? couldn't we have nitrated? couldn't you have nitrated? couldn't they have nitrated?	couldn't I have been nitrating? couldn't you have been nitrating? couldn't he have been nitrating? couldn't we have been nitrating? couldn't you have been nitrating? couldn't they have been nitrating?