English verb conjugation
COULD SYNTHESIZE

Regular verb: synthesize - synthesized - synthesized

Affirmation

Simple form	V-ing form
I could synthesize you could synthesize he could synthesize we could synthesize you could synthesize they could synthesize	I could be synthesizing you could be synthesizing he could be synthesizing we could be synthesizing you could be synthesizing they could be synthesizing
Perfect	V-ing perfect
I could have synthesized you could have synthesized he could have synthesized we could have synthesized you could have synthesized they could have synthesized	I could have been synthesizing you could have been synthesizing he could have been synthesizing we could have been synthesizing you could have been synthesizing they could have been synthesizing

Negation

Simple form	V-ing form
I could not synthesize you could not synthesize he could not synthesize we could not synthesize you could not synthesize they could not synthesize	I could not be synthesizing you could not be synthesizing he could not be synthesizing we could not be synthesizing you could not be synthesizing they could not be synthesizing
Perfect	V-ing perfect
I could not have synthesized you could not have synthesized he could not have synthesized we could not have synthesized you could not have synthesized they could not have synthesized	I could not have been synthesizing you could not have been synthesizing he could not have been synthesizing we could not have been synthesizing you could not have been synthesizing they could not have been synthesizing

Interrogative form

Simple form	V-ing form
could I synthesize? could you synthesize? could he synthesize? could we synthesize? could you synthesize? could they synthesize?	could I be synthesizing? could you be synthesizing? could he be synthesizing? could we be synthesizing? could you be synthesizing? could they be synthesizing?
Perfect	V-ing perfect
could I have synthesized? could you have synthesized? could he have synthesized? could we have synthesized? could you have synthesized? could they have synthesized?	could I have been synthesizing? could you have been synthesizing? could he have been synthesizing? could we have been synthesizing? could you have been synthesizing? could they have been synthesizing?

Interro-negative form

Simple form	V-ing form
could I not synthesize? could you not synthesize? could he not synthesize? could we not synthesize? could you not synthesize? could they not synthesize?	could I not be synthesizing? could you not be synthesizing? could he not be synthesizing? could we not be synthesizing? could you not be synthesizing? could they not be synthesizing?
Perfect	V-ing perfect
could I not have synthesized? could you not have synthesized? could he not have synthesized? could we not have synthesized? could you not have synthesized? could they not have synthesized?	could I not have been synthesizing? could you not have been synthesizing? could he not have been synthesizing? could we not have been synthesizing? could you not have been synthesizing? could they not have been synthesizing?