Conjugação do verbo inglês
MUST BIFF

Verbo regular: biff - biffed - biffed

Afirmação

Forma simple	Forma com V-ing
I must biff you must biff she must biff we must biff you must biff they must biff	I must be biffing you must be biffing she must be biffing we must be biffing you must be biffing they must be biffing
Perfeito	Perfeito com V-ing
I must have biffed you must have biffed she must have biffed we must have biffed you must have biffed they must have biffed	I must have been biffing you must have been biffing she must have been biffing we must have been biffing you must have been biffing they must have been biffing

Negação

Forma simple	Forma com V-ing
I mustn't biff you mustn't biff she mustn't biff we mustn't biff you mustn't biff they mustn't biff	I mustn't be biffing you mustn't be biffing she mustn't be biffing we mustn't be biffing you mustn't be biffing they mustn't be biffing
Perfeito	Perfeito com V-ing
I mustn't have biffed you mustn't have biffed she mustn't have biffed we mustn't have biffed you mustn't have biffed they mustn't have biffed	I mustn't have been biffing you mustn't have been biffing she mustn't have been biffing we mustn't have been biffing you mustn't have been biffing they mustn't have been biffing

Forma interrogativa

Forma simple	Forma com V-ing
must I biff? must you biff? must she biff? must we biff? must you biff? must they biff?	must I be biffing? must you be biffing? must she be biffing? must we be biffing? must you be biffing? must they be biffing?
Perfeito	Perfeito com V-ing
must I have biffed? must you have biffed? must she have biffed? must we have biffed? must you have biffed? must they have biffed?	must I have been biffing? must you have been biffing? must she have been biffing? must we have been biffing? must you have been biffing? must they have been biffing?

Forma interro-Negação

Forma simple	Forma com V-ing
mustn't I biff? mustn't you biff? mustn't she biff? mustn't we biff? mustn't you biff? mustn't they biff?	mustn't I be biffing? mustn't you be biffing? mustn't she be biffing? mustn't we be biffing? mustn't you be biffing? mustn't they be biffing?
Perfeito	Perfeito com V-ing
mustn't I have biffed? mustn't you have biffed? mustn't she have biffed? mustn't we have biffed? mustn't you have biffed? mustn't they have biffed?	mustn't I have been biffing? mustn't you have been biffing? mustn't she have been biffing? mustn't we have been biffing? mustn't you have been biffing? mustn't they have been biffing?