English verb conjugation
COULD SYMMETRIZE

Regular verb: symmetrize - symmetrized - symmetrized

Affirmation

Simple form	V-ing form
I could symmetrize you could symmetrize he could symmetrize we could symmetrize you could symmetrize they could symmetrize	I could be symmetrizing you could be symmetrizing he could be symmetrizing we could be symmetrizing you could be symmetrizing they could be symmetrizing
Perfect	V-ing perfect
I could have symmetrized you could have symmetrized he could have symmetrized we could have symmetrized you could have symmetrized they could have symmetrized	I could have been symmetrizing you could have been symmetrizing he could have been symmetrizing we could have been symmetrizing you could have been symmetrizing they could have been symmetrizing

Negation

Simple form	V-ing form
I couldn't symmetrize you couldn't symmetrize he couldn't symmetrize we couldn't symmetrize you couldn't symmetrize they couldn't symmetrize	I couldn't be symmetrizing you couldn't be symmetrizing he couldn't be symmetrizing we couldn't be symmetrizing you couldn't be symmetrizing they couldn't be symmetrizing
Perfect	V-ing perfect
I couldn't have symmetrized you couldn't have symmetrized he couldn't have symmetrized we couldn't have symmetrized you couldn't have symmetrized they couldn't have symmetrized	I couldn't have been symmetrizing you couldn't have been symmetrizing he couldn't have been symmetrizing we couldn't have been symmetrizing you couldn't have been symmetrizing they couldn't have been symmetrizing

Interrogative form

Simple form	V-ing form
could I symmetrize? could you symmetrize? could he symmetrize? could we symmetrize? could you symmetrize? could they symmetrize?	could I be symmetrizing? could you be symmetrizing? could he be symmetrizing? could we be symmetrizing? could you be symmetrizing? could they be symmetrizing?
Perfect	V-ing perfect
could I have symmetrized? could you have symmetrized? could he have symmetrized? could we have symmetrized? could you have symmetrized? could they have symmetrized?	could I have been symmetrizing? could you have been symmetrizing? could he have been symmetrizing? could we have been symmetrizing? could you have been symmetrizing? could they have been symmetrizing?

Interro-negative form

Simple form	V-ing form
couldn't I symmetrize? couldn't you symmetrize? couldn't he symmetrize? couldn't we symmetrize? couldn't you symmetrize? couldn't they symmetrize?	couldn't I be symmetrizing? couldn't you be symmetrizing? couldn't he be symmetrizing? couldn't we be symmetrizing? couldn't you be symmetrizing? couldn't they be symmetrizing?
Perfect	V-ing perfect
couldn't I have symmetrized? couldn't you have symmetrized? couldn't he have symmetrized? couldn't we have symmetrized? couldn't you have symmetrized? couldn't they have symmetrized?	couldn't I have been symmetrizing? couldn't you have been symmetrizing? couldn't he have been symmetrizing? couldn't we have been symmetrizing? couldn't you have been symmetrizing? couldn't they have been symmetrizing?