I could sympathize you could sympathize he could sympathize we could sympathize you could sympathize they could sympathize
V-ing form
I could be sympathizing you could be sympathizing he could be sympathizing we could be sympathizing you could be sympathizing they could be sympathizing
Perfect
I could have sympathized you could have sympathized he could have sympathized we could have sympathized you could have sympathized they could have sympathized
V-ing perfect
I could have been sympathizing you could have been sympathizing he could have been sympathizing we could have been sympathizing you could have been sympathizing they could have been sympathizing
Negation
Simple form
I could not sympathize you could not sympathize he could not sympathize we could not sympathize you could not sympathize they could not sympathize
V-ing form
I could not be sympathizing you could not be sympathizing he could not be sympathizing we could not be sympathizing you could not be sympathizing they could not be sympathizing
Perfect
I could not have sympathized you could not have sympathized he could not have sympathized we could not have sympathized you could not have sympathized they could not have sympathized
V-ing perfect
I could not have been sympathizing you could not have been sympathizing he could not have been sympathizing we could not have been sympathizing you could not have been sympathizing they could not have been sympathizing
Interrogative form
Simple form
could I sympathize? could you sympathize? could he sympathize? could we sympathize? could you sympathize? could they sympathize?
V-ing form
could I be sympathizing? could you be sympathizing? could he be sympathizing? could we be sympathizing? could you be sympathizing? could they be sympathizing?
Perfect
could I have sympathized? could you have sympathized? could he have sympathized? could we have sympathized? could you have sympathized? could they have sympathized?
V-ing perfect
could I have been sympathizing? could you have been sympathizing? could he have been sympathizing? could we have been sympathizing? could you have been sympathizing? could they have been sympathizing?
Interro-negative form
Simple form
could I not sympathize? could you not sympathize? could he not sympathize? could we not sympathize? could you not sympathize? could they not sympathize?
V-ing form
could I not be sympathizing? could you not be sympathizing? could he not be sympathizing? could we not be sympathizing? could you not be sympathizing? could they not be sympathizing?
Perfect
could I not have sympathized? could you not have sympathized? could he not have sympathized? could we not have sympathized? could you not have sympathized? could they not have sympathized?
V-ing perfect
could I not have been sympathizing? could you not have been sympathizing? could he not have been sympathizing? could we not have been sympathizing? could you not have been sympathizing? could they not have been sympathizing?