must improve
Verbo regular: improve - improved- improved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must improve
you must improve
she must improve
we must improve
you must improve
they must improve 	I must be improving
you must be improving
she must be improving
we must be improving
you must be improving
they must be improving	I must have improved
you must have improved
she must have improved
we must have improved
you must have improved
they must have improved	I must have been improving
you must have been improving
she must have been improving
we must have been improving
you must have been improving
they must have been improving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't improve
you mustn't improve
she mustn't improve
we mustn't improve
you mustn't improve
they mustn't improve 	I mustn't be improving
you mustn't be improving
she mustn't be improving
we mustn't be improving
you mustn't be improving
they mustn't be improving	I mustn't have improved
you mustn't have improved
she mustn't have improved
we mustn't have improved
you mustn't have improved
they mustn't have improved	I mustn't have been improving
you mustn't have been improving
she mustn't have been improving
we mustn't have been improving
you mustn't have been improving
they mustn't have been improving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I improve?
must you improve?
must she improve?
must we improve?
must you improve?
must they improve? 	must I be improving?
must you be improving?
must she be improving?
must we be improving?
must you be improving?
must they be improving? 	must I have improved?
must you have improved?
must she have improved?
must we have improved?
must you have improved?
must they have improved? 	must I have been improving?
must you have been improving?
must she have been improving?
must we have been improving?
must you have been improving?
must they have been improving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I improve?
mustn't you improve?
mustn't she improve?
mustn't we improve?
mustn't you improve?
mustn't they improve? 	mustn't I be improving?
mustn't you be improving?
mustn't she be improving?
mustn't we be improving?
mustn't you be improving?
mustn't they be improving? 	mustn't I have improved?
mustn't you have improved?
mustn't she have improved?
mustn't we have improved?
mustn't you have improved?
mustn't they have improved? 	mustn't I have been improving?
mustn't you have been improving?
mustn't she have been improving?
mustn't we have been improving?
mustn't you have been improving?
mustn't they have been improving?