English verb conjugation
COULD BOLSTER

Regular verb: bolster - bolstered - bolstered

Affirmation

Simple form	V-ing form
I could bolster you could bolster she could bolster we could bolster you could bolster they could bolster	I could be bolstering you could be bolstering she could be bolstering we could be bolstering you could be bolstering they could be bolstering
Perfect	V-ing perfect
I could have bolstered you could have bolstered she could have bolstered we could have bolstered you could have bolstered they could have bolstered	I could have been bolstering you could have been bolstering she could have been bolstering we could have been bolstering you could have been bolstering they could have been bolstering

Negation

Simple form	V-ing form
I couldn't bolster you couldn't bolster she couldn't bolster we couldn't bolster you couldn't bolster they couldn't bolster	I couldn't be bolstering you couldn't be bolstering she couldn't be bolstering we couldn't be bolstering you couldn't be bolstering they couldn't be bolstering
Perfect	V-ing perfect
I couldn't have bolstered you couldn't have bolstered she couldn't have bolstered we couldn't have bolstered you couldn't have bolstered they couldn't have bolstered	I couldn't have been bolstering you couldn't have been bolstering she couldn't have been bolstering we couldn't have been bolstering you couldn't have been bolstering they couldn't have been bolstering

Interrogative form

Simple form	V-ing form
could I bolster? could you bolster? could she bolster? could we bolster? could you bolster? could they bolster?	could I be bolstering? could you be bolstering? could she be bolstering? could we be bolstering? could you be bolstering? could they be bolstering?
Perfect	V-ing perfect
could I have bolstered? could you have bolstered? could she have bolstered? could we have bolstered? could you have bolstered? could they have bolstered?	could I have been bolstering? could you have been bolstering? could she have been bolstering? could we have been bolstering? could you have been bolstering? could they have been bolstering?

Interro-negative form

Simple form	V-ing form
couldn't I bolster? couldn't you bolster? couldn't she bolster? couldn't we bolster? couldn't you bolster? couldn't they bolster?	couldn't I be bolstering? couldn't you be bolstering? couldn't she be bolstering? couldn't we be bolstering? couldn't you be bolstering? couldn't they be bolstering?
Perfect	V-ing perfect
couldn't I have bolstered? couldn't you have bolstered? couldn't she have bolstered? couldn't we have bolstered? couldn't you have bolstered? couldn't they have bolstered?	couldn't I have been bolstering? couldn't you have been bolstering? couldn't she have been bolstering? couldn't we have been bolstering? couldn't you have been bolstering? couldn't they have been bolstering?