must grub
Verbo regolare: grub - grubbed- grubbed

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must grub
you must grub
she must grub
we must grub
you must grub
they must grub 	I must be grubbing
you must be grubbing
she must be grubbing
we must be grubbing
you must be grubbing
they must be grubbing	I must have grubbed
you must have grubbed
she 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
she must have been grubbing
we must have been grubbing
you must have been grubbing
they must have been grubbing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not grub
you must not grub
she must not grub
we must not grub
you must not grub
they must not grub 	I must not be grubbing
you must not be grubbing
she must not be grubbing
we must not be grubbing
you must not be grubbing
they must not be grubbing	I must not have grubbed
you must not have grubbed
she must not have grubbed
we must not have grubbed
you must not have grubbed
they must not have grubbed	I must not have been grubbing
you must not have been grubbing
she must not have been grubbing
we must not have been grubbing
you must not have been grubbing
they must not have been grubbing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I grub?
must you grub?
must she grub?
must we grub?
must you grub?
must they grub? 	must I be grubbing?
must you be grubbing?
must she be grubbing?
must we be grubbing?
must you be grubbing?
must they be grubbing? 	must I have grubbed?
must you have grubbed?
must she 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 she have been grubbing?
must we have been grubbing?
must you have been grubbing?
must they have been grubbing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not grub?
must you not grub?
must she not grub?
must we not grub?
must you not grub?
must they not grub? 	must I not be grubbing?
must you not be grubbing?
must she not be grubbing?
must we not be grubbing?
must you not be grubbing?
must they not be grubbing? 	must I not have grubbed?
must you not have grubbed?
must she not have grubbed?
must we not have grubbed?
must you not have grubbed?
must they not have grubbed? 	must I not have been grubbing?
must you not have been grubbing?
must she not have been grubbing?
must we not have been grubbing?
must you not have been grubbing?
must they not have been grubbing?