must grub
Verbo regular: grub - grubbed- grubbed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must grub
you must grub
he must grub
we must grub
you must grub
they must grub 	I must be grubbing
you must be grubbing
he must be grubbing
we must be grubbing
you must be grubbing
they must be grubbing	I must have grubbed
you must have grubbed
he must have grubbed
we must have grubbed
you must have grubbed
they must have grubbed	I must have been grubbing
you must have been grubbing
he must have been grubbing
we must have been grubbing
you must have been grubbing
they must have been grubbing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't grub
you mustn't grub
he mustn't grub
we mustn't grub
you mustn't grub
they mustn't grub 	I mustn't be grubbing
you mustn't be grubbing
he mustn't be grubbing
we mustn't be grubbing
you mustn't be grubbing
they mustn't be grubbing	I mustn't have grubbed
you mustn't have grubbed
he mustn't have grubbed
we mustn't have grubbed
you mustn't have grubbed
they mustn't have grubbed	I mustn't have been grubbing
you mustn't have been grubbing
he mustn't have been grubbing
we mustn't have been grubbing
you mustn't have been grubbing
they mustn't have been grubbing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I grub?
must you grub?
must he grub?
must we grub?
must you grub?
must they grub? 	must I be grubbing?
must you be grubbing?
must he be grubbing?
must we be grubbing?
must you be grubbing?
must they be grubbing? 	must I have grubbed?
must you have grubbed?
must he have grubbed?
must we have grubbed?
must you have grubbed?
must they have grubbed? 	must I have been grubbing?
must you have been grubbing?
must he have been grubbing?
must we have been grubbing?
must you have been grubbing?
must they have been grubbing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I grub?
mustn't you grub?
mustn't he grub?
mustn't we grub?
mustn't you grub?
mustn't they grub? 	mustn't I be grubbing?
mustn't you be grubbing?
mustn't he be grubbing?
mustn't we be grubbing?
mustn't you be grubbing?
mustn't they be grubbing? 	mustn't I have grubbed?
mustn't you have grubbed?
mustn't he have grubbed?
mustn't we have grubbed?
mustn't you have grubbed?
mustn't they have grubbed? 	mustn't I have been grubbing?
mustn't you have been grubbing?
mustn't he have been grubbing?
mustn't we have been grubbing?
mustn't you have been grubbing?
mustn't they have been grubbing?