must grab
Verbo regular: grab - grabbed- grabbed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must grab
you must grab
he must grab
we must grab
you must grab
they must grab 	I must be grabbing
you must be grabbing
he must be grabbing
we must be grabbing
you must be grabbing
they must be grabbing	I must have grabbed
you must have grabbed
he must have grabbed
we must have grabbed
you must have grabbed
they must have grabbed	I must have been grabbing
you must have been grabbing
he must have been grabbing
we must have been grabbing
you must have been grabbing
they must have been grabbing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't grab
you mustn't grab
he mustn't grab
we mustn't grab
you mustn't grab
they mustn't grab 	I mustn't be grabbing
you mustn't be grabbing
he mustn't be grabbing
we mustn't be grabbing
you mustn't be grabbing
they mustn't be grabbing	I mustn't have grabbed
you mustn't have grabbed
he mustn't have grabbed
we mustn't have grabbed
you mustn't have grabbed
they mustn't have grabbed	I mustn't have been grabbing
you mustn't have been grabbing
he mustn't have been grabbing
we mustn't have been grabbing
you mustn't have been grabbing
they mustn't have been grabbing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I grab?
must you grab?
must he grab?
must we grab?
must you grab?
must they grab? 	must I be grabbing?
must you be grabbing?
must he be grabbing?
must we be grabbing?
must you be grabbing?
must they be grabbing? 	must I have grabbed?
must you have grabbed?
must he have grabbed?
must we have grabbed?
must you have grabbed?
must they have grabbed? 	must I have been grabbing?
must you have been grabbing?
must he have been grabbing?
must we have been grabbing?
must you have been grabbing?
must they have been grabbing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I grab?
mustn't you grab?
mustn't he grab?
mustn't we grab?
mustn't you grab?
mustn't they grab? 	mustn't I be grabbing?
mustn't you be grabbing?
mustn't he be grabbing?
mustn't we be grabbing?
mustn't you be grabbing?
mustn't they be grabbing? 	mustn't I have grabbed?
mustn't you have grabbed?
mustn't he have grabbed?
mustn't we have grabbed?
mustn't you have grabbed?
mustn't they have grabbed? 	mustn't I have been grabbing?
mustn't you have been grabbing?
mustn't he have been grabbing?
mustn't we have been grabbing?
mustn't you have been grabbing?
mustn't they have been grabbing?