must rat
Verbo regular: rat - ratted- ratted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must rat
you must rat
he must rat
we must rat
you must rat
they must rat 	I must be ratting
you must be ratting
he must be ratting
we must be ratting
you must be ratting
they must be ratting	I must have ratted
you must have ratted
he must have ratted
we must have ratted
you must have ratted
they must have ratted	I must have been ratting
you must have been ratting
he must have been ratting
we must have been ratting
you must have been ratting
they must have been ratting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't rat
you mustn't rat
he mustn't rat
we mustn't rat
you mustn't rat
they mustn't rat 	I mustn't be ratting
you mustn't be ratting
he mustn't be ratting
we mustn't be ratting
you mustn't be ratting
they mustn't be ratting	I mustn't have ratted
you mustn't have ratted
he mustn't have ratted
we mustn't have ratted
you mustn't have ratted
they mustn't have ratted	I mustn't have been ratting
you mustn't have been ratting
he mustn't have been ratting
we mustn't have been ratting
you mustn't have been ratting
they mustn't have been ratting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I rat?
must you rat?
must he rat?
must we rat?
must you rat?
must they rat? 	must I be ratting?
must you be ratting?
must he be ratting?
must we be ratting?
must you be ratting?
must they be ratting? 	must I have ratted?
must you have ratted?
must he have ratted?
must we have ratted?
must you have ratted?
must they have ratted? 	must I have been ratting?
must you have been ratting?
must he have been ratting?
must we have been ratting?
must you have been ratting?
must they have been ratting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I rat?
mustn't you rat?
mustn't he rat?
mustn't we rat?
mustn't you rat?
mustn't they rat? 	mustn't I be ratting?
mustn't you be ratting?
mustn't he be ratting?
mustn't we be ratting?
mustn't you be ratting?
mustn't they be ratting? 	mustn't I have ratted?
mustn't you have ratted?
mustn't he have ratted?
mustn't we have ratted?
mustn't you have ratted?
mustn't they have ratted? 	mustn't I have been ratting?
mustn't you have been ratting?
mustn't he have been ratting?
mustn't we have been ratting?
mustn't you have been ratting?
mustn't they have been ratting?