English verb conjugation
MUST BACKSTOP

Regular verb: backstop - backstoped - backstoped

Affirmation

Simple form	V-ing form
I must backstop you must backstop she must backstop we must backstop you must backstop they must backstop	I must be backstoping you must be backstoping she must be backstoping we must be backstoping you must be backstoping they must be backstoping
Perfect	V-ing perfect
I must have backstoped you must have backstoped she must have backstoped we must have backstoped you must have backstoped they must have backstoped	I must have been backstoping you must have been backstoping she must have been backstoping we must have been backstoping you must have been backstoping they must have been backstoping

Negation

Simple form	V-ing form
I mustn't backstop you mustn't backstop she mustn't backstop we mustn't backstop you mustn't backstop they mustn't backstop	I mustn't be backstoping you mustn't be backstoping she mustn't be backstoping we mustn't be backstoping you mustn't be backstoping they mustn't be backstoping
Perfect	V-ing perfect
I mustn't have backstoped you mustn't have backstoped she mustn't have backstoped we mustn't have backstoped you mustn't have backstoped they mustn't have backstoped	I mustn't have been backstoping you mustn't have been backstoping she mustn't have been backstoping we mustn't have been backstoping you mustn't have been backstoping they mustn't have been backstoping

Interrogative form

Simple form	V-ing form
must I backstop? must you backstop? must she backstop? must we backstop? must you backstop? must they backstop?	must I be backstoping? must you be backstoping? must she be backstoping? must we be backstoping? must you be backstoping? must they be backstoping?
Perfect	V-ing perfect
must I have backstoped? must you have backstoped? must she have backstoped? must we have backstoped? must you have backstoped? must they have backstoped?	must I have been backstoping? must you have been backstoping? must she have been backstoping? must we have been backstoping? must you have been backstoping? must they have been backstoping?

Interro-negative form

Simple form	V-ing form
mustn't I backstop? mustn't you backstop? mustn't she backstop? mustn't we backstop? mustn't you backstop? mustn't they backstop?	mustn't I be backstoping? mustn't you be backstoping? mustn't she be backstoping? mustn't we be backstoping? mustn't you be backstoping? mustn't they be backstoping?
Perfect	V-ing perfect
mustn't I have backstoped? mustn't you have backstoped? mustn't she have backstoped? mustn't we have backstoped? mustn't you have backstoped? mustn't they have backstoped?	mustn't I have been backstoping? mustn't you have been backstoping? mustn't she have been backstoping? mustn't we have been backstoping? mustn't you have been backstoping? mustn't they have been backstoping?