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 couldn't muss you couldn't muss he couldn't muss we couldn't muss you couldn't muss they couldn't muss	I couldn't be mussing you couldn't be mussing he couldn't be mussing we couldn't be mussing you couldn't be mussing they couldn't be mussing
Perfect	V-ing perfect
I couldn't have mussed you couldn't have mussed he couldn't have mussed we couldn't have mussed you couldn't have mussed they couldn't have mussed	I couldn't have been mussing you couldn't have been mussing he couldn't have been mussing we couldn't have been mussing you couldn't have been mussing they couldn't 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
couldn't I muss? couldn't you muss? couldn't he muss? couldn't we muss? couldn't you muss? couldn't they muss?	couldn't I be mussing? couldn't you be mussing? couldn't he be mussing? couldn't we be mussing? couldn't you be mussing? couldn't they be mussing?
Perfect	V-ing perfect
couldn't I have mussed? couldn't you have mussed? couldn't he have mussed? couldn't we have mussed? couldn't you have mussed? couldn't they have mussed?	couldn't I have been mussing? couldn't you have been mussing? couldn't he have been mussing? couldn't we have been mussing? couldn't you have been mussing? couldn't they have been mussing?