must quirt
Verbo regular: quirt - quirted- quirted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must quirt
you must quirt
she must quirt
we must quirt
you must quirt
they must quirt 	I must be quirting
you must be quirting
she must be quirting
we must be quirting
you must be quirting
they must be quirting	I must have quirted
you must have quirted
she must have quirted
we must have quirted
you must have quirted
they must have quirted	I must have been quirting
you must have been quirting
she must have been quirting
we must have been quirting
you must have been quirting
they must have been quirting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't quirt
you mustn't quirt
she mustn't quirt
we mustn't quirt
you mustn't quirt
they mustn't quirt 	I mustn't be quirting
you mustn't be quirting
she mustn't be quirting
we mustn't be quirting
you mustn't be quirting
they mustn't be quirting	I mustn't have quirted
you mustn't have quirted
she mustn't have quirted
we mustn't have quirted
you mustn't have quirted
they mustn't have quirted	I mustn't have been quirting
you mustn't have been quirting
she mustn't have been quirting
we mustn't have been quirting
you mustn't have been quirting
they mustn't have been quirting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I quirt?
must you quirt?
must she quirt?
must we quirt?
must you quirt?
must they quirt? 	must I be quirting?
must you be quirting?
must she be quirting?
must we be quirting?
must you be quirting?
must they be quirting? 	must I have quirted?
must you have quirted?
must she have quirted?
must we have quirted?
must you have quirted?
must they have quirted? 	must I have been quirting?
must you have been quirting?
must she have been quirting?
must we have been quirting?
must you have been quirting?
must they have been quirting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I quirt?
mustn't you quirt?
mustn't she quirt?
mustn't we quirt?
mustn't you quirt?
mustn't they quirt? 	mustn't I be quirting?
mustn't you be quirting?
mustn't she be quirting?
mustn't we be quirting?
mustn't you be quirting?
mustn't they be quirting? 	mustn't I have quirted?
mustn't you have quirted?
mustn't she have quirted?
mustn't we have quirted?
mustn't you have quirted?
mustn't they have quirted? 	mustn't I have been quirting?
mustn't you have been quirting?
mustn't she have been quirting?
mustn't we have been quirting?
mustn't you have been quirting?
mustn't they have been quirting?