English verb conjugation
COULD INVERT

Regular verb: invert - inverted - inverted

Affirmation

Simple form	V-ing form
I could invert you could invert he could invert we could invert you could invert they could invert	I could be inverting you could be inverting he could be inverting we could be inverting you could be inverting they could be inverting
Perfect	V-ing perfect
I could have inverted you could have inverted he could have inverted we could have inverted you could have inverted they could have inverted	I could have been inverting you could have been inverting he could have been inverting we could have been inverting you could have been inverting they could have been inverting

Negation

Simple form	V-ing form
I could not invert you could not invert he could not invert we could not invert you could not invert they could not invert	I could not be inverting you could not be inverting he could not be inverting we could not be inverting you could not be inverting they could not be inverting
Perfect	V-ing perfect
I could not have inverted you could not have inverted he could not have inverted we could not have inverted you could not have inverted they could not have inverted	I could not have been inverting you could not have been inverting he could not have been inverting we could not have been inverting you could not have been inverting they could not have been inverting

Interrogative form

Simple form	V-ing form
could I invert? could you invert? could he invert? could we invert? could you invert? could they invert?	could I be inverting? could you be inverting? could he be inverting? could we be inverting? could you be inverting? could they be inverting?
Perfect	V-ing perfect
could I have inverted? could you have inverted? could he have inverted? could we have inverted? could you have inverted? could they have inverted?	could I have been inverting? could you have been inverting? could he have been inverting? could we have been inverting? could you have been inverting? could they have been inverting?

Interro-negative form

Simple form	V-ing form
could I not invert? could you not invert? could he not invert? could we not invert? could you not invert? could they not invert?	could I not be inverting? could you not be inverting? could he not be inverting? could we not be inverting? could you not be inverting? could they not be inverting?
Perfect	V-ing perfect
could I not have inverted? could you not have inverted? could he not have inverted? could we not have inverted? could you not have inverted? could they not have inverted?	could I not have been inverting? could you not have been inverting? could he not have been inverting? could we not have been inverting? could you not have been inverting? could they not have been inverting?