English verb conjugation
COULD MUSS

Regular verb: muss - mussed - mussed

Affirmation

Simple form	V-ing form
I could muss you could muss he could muss we could muss you could muss they could muss	I could be mussing you could be mussing he could be mussing we could be mussing you could be mussing they could be mussing
Perfect	V-ing perfect
I could have mussed you could have mussed he could have mussed we could have mussed you could have mussed they could have mussed	I could have been mussing you could have been mussing he could have been mussing we could have been mussing you could have been mussing they could have been mussing

Negation

Simple form	V-ing form
I could not muss you could not muss he could not muss we could not muss you could not muss they could not muss	I could not be mussing you could not be mussing he could not be mussing we could not be mussing you could not be mussing they could not be mussing
Perfect	V-ing perfect
I could not have mussed you could not have mussed he could not have mussed we could not have mussed you could not have mussed they could not have mussed	I could not have been mussing you could not have been mussing he could not have been mussing we could not have been mussing you could not have been mussing they could not have been mussing

Interrogative form

Simple form	V-ing form
could I muss? could you muss? could he muss? could we muss? could you muss? could they muss?	could I be mussing? could you be mussing? could he be mussing? could we be mussing? could you be mussing? could they be mussing?
Perfect	V-ing perfect
could I have mussed? could you have mussed? could he have mussed? could we have mussed? could you have mussed? could they have mussed?	could I have been mussing? could you have been mussing? could he have been mussing? could we have been mussing? could you have been mussing? could they have been mussing?

Interro-negative form

Simple form	V-ing form
could I not muss? could you not muss? could he not muss? could we not muss? could you not muss? could they not muss?	could I not be mussing? could you not be mussing? could he not be mussing? could we not be mussing? could you not be mussing? could they not be mussing?
Perfect	V-ing perfect
could I not have mussed? could you not have mussed? could he not have mussed? could we not have mussed? could you not have mussed? could they not have mussed?	could I not have been mussing? could you not have been mussing? could he not have been mussing? could we not have been mussing? could you not have been mussing? could they not have been mussing?