English verb conjugation
COULD THEORIZE

Regular verb: theorize - theorized - theorized

Affirmation

Simple form	V-ing form
I could theorize you could theorize he could theorize we could theorize you could theorize they could theorize	I could be theorizing you could be theorizing he could be theorizing we could be theorizing you could be theorizing they could be theorizing
Perfect	V-ing perfect
I could have theorized you could have theorized he could have theorized we could have theorized you could have theorized they could have theorized	I could have been theorizing you could have been theorizing he could have been theorizing we could have been theorizing you could have been theorizing they could have been theorizing

Negation

Simple form	V-ing form
I couldn't theorize you couldn't theorize he couldn't theorize we couldn't theorize you couldn't theorize they couldn't theorize	I couldn't be theorizing you couldn't be theorizing he couldn't be theorizing we couldn't be theorizing you couldn't be theorizing they couldn't be theorizing
Perfect	V-ing perfect
I couldn't have theorized you couldn't have theorized he couldn't have theorized we couldn't have theorized you couldn't have theorized they couldn't have theorized	I couldn't have been theorizing you couldn't have been theorizing he couldn't have been theorizing we couldn't have been theorizing you couldn't have been theorizing they couldn't have been theorizing

Interrogative form

Simple form	V-ing form
could I theorize? could you theorize? could he theorize? could we theorize? could you theorize? could they theorize?	could I be theorizing? could you be theorizing? could he be theorizing? could we be theorizing? could you be theorizing? could they be theorizing?
Perfect	V-ing perfect
could I have theorized? could you have theorized? could he have theorized? could we have theorized? could you have theorized? could they have theorized?	could I have been theorizing? could you have been theorizing? could he have been theorizing? could we have been theorizing? could you have been theorizing? could they have been theorizing?

Interro-negative form

Simple form	V-ing form
couldn't I theorize? couldn't you theorize? couldn't he theorize? couldn't we theorize? couldn't you theorize? couldn't they theorize?	couldn't I be theorizing? couldn't you be theorizing? couldn't he be theorizing? couldn't we be theorizing? couldn't you be theorizing? couldn't they be theorizing?
Perfect	V-ing perfect
couldn't I have theorized? couldn't you have theorized? couldn't he have theorized? couldn't we have theorized? couldn't you have theorized? couldn't they have theorized?	couldn't I have been theorizing? couldn't you have been theorizing? couldn't he have been theorizing? couldn't we have been theorizing? couldn't you have been theorizing? couldn't they have been theorizing?