Conjugación del verbo inglés
MUST GRUB

Verbo regular: grub - grubbed - grubbed

Afirmación

Forma simple	Forma con 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
Perfecto	Perfecto con V-ing
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

Negación

Forma simple	Forma con 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
Perfecto	Perfecto con V-ing
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 con 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?
Perfecto	Perfecto con V-ing
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-negativa

Forma simple	Forma con 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?
Perfecto	Perfecto con V-ing
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?