must base
Verbo regular: base - based- based

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must base
you must base
he must base
we must base
you must base
they must base 	I must be basing
you must be basing
he must be basing
we must be basing
you must be basing
they must be basing	I must have based
you must have based
he must have based
we must have based
you must have based
they must have based	I must have been basing
you must have been basing
he must have been basing
we must have been basing
you must have been basing
they must have been basing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't base
you mustn't base
he mustn't base
we mustn't base
you mustn't base
they mustn't base 	I mustn't be basing
you mustn't be basing
he mustn't be basing
we mustn't be basing
you mustn't be basing
they mustn't be basing	I mustn't have based
you mustn't have based
he mustn't have based
we mustn't have based
you mustn't have based
they mustn't have based	I mustn't have been basing
you mustn't have been basing
he mustn't have been basing
we mustn't have been basing
you mustn't have been basing
they mustn't have been basing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I base?
must you base?
must he base?
must we base?
must you base?
must they base? 	must I be basing?
must you be basing?
must he be basing?
must we be basing?
must you be basing?
must they be basing? 	must I have based?
must you have based?
must he have based?
must we have based?
must you have based?
must they have based? 	must I have been basing?
must you have been basing?
must he have been basing?
must we have been basing?
must you have been basing?
must they have been basing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I base?
mustn't you base?
mustn't he base?
mustn't we base?
mustn't you base?
mustn't they base? 	mustn't I be basing?
mustn't you be basing?
mustn't he be basing?
mustn't we be basing?
mustn't you be basing?
mustn't they be basing? 	mustn't I have based?
mustn't you have based?
mustn't he have based?
mustn't we have based?
mustn't you have based?
mustn't they have based? 	mustn't I have been basing?
mustn't you have been basing?
mustn't he have been basing?
mustn't we have been basing?
mustn't you have been basing?
mustn't they have been basing?