I could popularize you could popularize he could popularize we could popularize you could popularize they could popularize
V-ing form
I could be popularizing you could be popularizing he could be popularizing we could be popularizing you could be popularizing they could be popularizing
Perfect
I could have popularized you could have popularized he could have popularized we could have popularized you could have popularized they could have popularized
V-ing perfect
I could have been popularizing you could have been popularizing he could have been popularizing we could have been popularizing you could have been popularizing they could have been popularizing
Negation
Simple form
I could not popularize you could not popularize he could not popularize we could not popularize you could not popularize they could not popularize
V-ing form
I could not be popularizing you could not be popularizing he could not be popularizing we could not be popularizing you could not be popularizing they could not be popularizing
Perfect
I could not have popularized you could not have popularized he could not have popularized we could not have popularized you could not have popularized they could not have popularized
V-ing perfect
I could not have been popularizing you could not have been popularizing he could not have been popularizing we could not have been popularizing you could not have been popularizing they could not have been popularizing
Interrogative form
Simple form
could I popularize? could you popularize? could he popularize? could we popularize? could you popularize? could they popularize?
V-ing form
could I be popularizing? could you be popularizing? could he be popularizing? could we be popularizing? could you be popularizing? could they be popularizing?
Perfect
could I have popularized? could you have popularized? could he have popularized? could we have popularized? could you have popularized? could they have popularized?
V-ing perfect
could I have been popularizing? could you have been popularizing? could he have been popularizing? could we have been popularizing? could you have been popularizing? could they have been popularizing?
Interro-negative form
Simple form
could I not popularize? could you not popularize? could he not popularize? could we not popularize? could you not popularize? could they not popularize?
V-ing form
could I not be popularizing? could you not be popularizing? could he not be popularizing? could we not be popularizing? could you not be popularizing? could they not be popularizing?
Perfect
could I not have popularized? could you not have popularized? could he not have popularized? could we not have popularized? could you not have popularized? could they not have popularized?
V-ing perfect
could I not have been popularizing? could you not have been popularizing? could he not have been popularizing? could we not have been popularizing? could you not have been popularizing? could they not have been popularizing?