English verb conjugation
COULD MUSTER

Regular verb: muster - mustered - mustered

Affirmation

Simple form	V-ing form
I could muster you could muster he could muster we could muster you could muster they could muster	I could be mustering you could be mustering he could be mustering we could be mustering you could be mustering they could be mustering
Perfect	V-ing perfect
I could have mustered you could have mustered he could have mustered we could have mustered you could have mustered they could have mustered	I could have been mustering you could have been mustering he could have been mustering we could have been mustering you could have been mustering they could have been mustering

Negation

Simple form	V-ing form
I couldn't muster you couldn't muster he couldn't muster we couldn't muster you couldn't muster they couldn't muster	I couldn't be mustering you couldn't be mustering he couldn't be mustering we couldn't be mustering you couldn't be mustering they couldn't be mustering
Perfect	V-ing perfect
I couldn't have mustered you couldn't have mustered he couldn't have mustered we couldn't have mustered you couldn't have mustered they couldn't have mustered	I couldn't have been mustering you couldn't have been mustering he couldn't have been mustering we couldn't have been mustering you couldn't have been mustering they couldn't have been mustering

Interrogative form

Simple form	V-ing form
could I muster? could you muster? could he muster? could we muster? could you muster? could they muster?	could I be mustering? could you be mustering? could he be mustering? could we be mustering? could you be mustering? could they be mustering?
Perfect	V-ing perfect
could I have mustered? could you have mustered? could he have mustered? could we have mustered? could you have mustered? could they have mustered?	could I have been mustering? could you have been mustering? could he have been mustering? could we have been mustering? could you have been mustering? could they have been mustering?

Interro-negative form

Simple form	V-ing form
couldn't I muster? couldn't you muster? couldn't he muster? couldn't we muster? couldn't you muster? couldn't they muster?	couldn't I be mustering? couldn't you be mustering? couldn't he be mustering? couldn't we be mustering? couldn't you be mustering? couldn't they be mustering?
Perfect	V-ing perfect
couldn't I have mustered? couldn't you have mustered? couldn't he have mustered? couldn't we have mustered? couldn't you have mustered? couldn't they have mustered?	couldn't I have been mustering? couldn't you have been mustering? couldn't he have been mustering? couldn't we have been mustering? couldn't you have been mustering? couldn't they have been mustering?