I could pulse you could pulse she could pulse we could pulse you could pulse they could pulse
V-ing form
I could be pulsing you could be pulsing she could be pulsing we could be pulsing you could be pulsing they could be pulsing
Perfect
I could have pulsed you could have pulsed she could have pulsed we could have pulsed you could have pulsed they could have pulsed
V-ing perfect
I could have been pulsing you could have been pulsing she could have been pulsing we could have been pulsing you could have been pulsing they could have been pulsing
Negation
Simple form
I could not pulse you could not pulse she could not pulse we could not pulse you could not pulse they could not pulse
V-ing form
I could not be pulsing you could not be pulsing she could not be pulsing we could not be pulsing you could not be pulsing they could not be pulsing
Perfect
I could not have pulsed you could not have pulsed she could not have pulsed we could not have pulsed you could not have pulsed they could not have pulsed
V-ing perfect
I could not have been pulsing you could not have been pulsing she could not have been pulsing we could not have been pulsing you could not have been pulsing they could not have been pulsing
Interrogative form
Simple form
could I pulse? could you pulse? could she pulse? could we pulse? could you pulse? could they pulse?
V-ing form
could I be pulsing? could you be pulsing? could she be pulsing? could we be pulsing? could you be pulsing? could they be pulsing?
Perfect
could I have pulsed? could you have pulsed? could she have pulsed? could we have pulsed? could you have pulsed? could they have pulsed?
V-ing perfect
could I have been pulsing? could you have been pulsing? could she have been pulsing? could we have been pulsing? could you have been pulsing? could they have been pulsing?
Interro-negative form
Simple form
could I not pulse? could you not pulse? could she not pulse? could we not pulse? could you not pulse? could they not pulse?
V-ing form
could I not be pulsing? could you not be pulsing? could she not be pulsing? could we not be pulsing? could you not be pulsing? could they not be pulsing?
Perfect
could I not have pulsed? could you not have pulsed? could she not have pulsed? could we not have pulsed? could you not have pulsed? could they not have pulsed?
V-ing perfect
could I not have been pulsing? could you not have been pulsing? could she not have been pulsing? could we not have been pulsing? could you not have been pulsing? could they not have been pulsing?