I must backstop you must backstop she must backstop we must backstop you must backstop they must backstop
Forma com V-ing
I must be backstoping you must be backstoping she must be backstoping we must be backstoping you must be backstoping they must be backstoping
Perfeito
I must have backstoped you must have backstoped she must have backstoped we must have backstoped you must have backstoped they must have backstoped
Perfeito com V-ing
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
Negação
Forma simple
I mustn't backstop you mustn't backstop she mustn't backstop we mustn't backstop you mustn't backstop they mustn't backstop
Forma com V-ing
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
Perfeito
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
Perfeito com V-ing
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
Forma interrogativa
Forma simple
must I backstop? must you backstop? must she backstop? must we backstop? must you backstop? must they backstop?
Forma com V-ing
must I be backstoping? must you be backstoping? must she be backstoping? must we be backstoping? must you be backstoping? must they be backstoping?
Perfeito
must I have backstoped? must you have backstoped? must she have backstoped? must we have backstoped? must you have backstoped? must they have backstoped?
Perfeito com V-ing
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?
Forma interro-Negação
Forma simple
mustn't I backstop? mustn't you backstop? mustn't she backstop? mustn't we backstop? mustn't you backstop? mustn't they backstop?
Forma com V-ing
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?
Perfeito
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?
Perfeito com V-ing
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?