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