I must cackle you must cackle he must cackle we must cackle you must cackle they must cackle
Forma com V-ing
I must be cackling you must be cackling he must be cackling we must be cackling you must be cackling they must be cackling
Perfeito
I must have cackled you must have cackled he must have cackled we must have cackled you must have cackled they must have cackled
Perfeito com V-ing
I must have been cackling you must have been cackling he must have been cackling we must have been cackling you must have been cackling they must have been cackling
Negação
Forma simple
I mustn't cackle you mustn't cackle he mustn't cackle we mustn't cackle you mustn't cackle they mustn't cackle
Forma com V-ing
I mustn't be cackling you mustn't be cackling he mustn't be cackling we mustn't be cackling you mustn't be cackling they mustn't be cackling
Perfeito
I mustn't have cackled you mustn't have cackled he mustn't have cackled we mustn't have cackled you mustn't have cackled they mustn't have cackled
Perfeito com V-ing
I mustn't have been cackling you mustn't have been cackling he mustn't have been cackling we mustn't have been cackling you mustn't have been cackling they mustn't have been cackling
Forma interrogativa
Forma simple
must I cackle? must you cackle? must he cackle? must we cackle? must you cackle? must they cackle?
Forma com V-ing
must I be cackling? must you be cackling? must he be cackling? must we be cackling? must you be cackling? must they be cackling?
Perfeito
must I have cackled? must you have cackled? must he have cackled? must we have cackled? must you have cackled? must they have cackled?
Perfeito com V-ing
must I have been cackling? must you have been cackling? must he have been cackling? must we have been cackling? must you have been cackling? must they have been cackling?
Forma interro-Negação
Forma simple
mustn't I cackle? mustn't you cackle? mustn't he cackle? mustn't we cackle? mustn't you cackle? mustn't they cackle?
Forma com V-ing
mustn't I be cackling? mustn't you be cackling? mustn't he be cackling? mustn't we be cackling? mustn't you be cackling? mustn't they be cackling?
Perfeito
mustn't I have cackled? mustn't you have cackled? mustn't he have cackled? mustn't we have cackled? mustn't you have cackled? mustn't they have cackled?
Perfeito com V-ing
mustn't I have been cackling? mustn't you have been cackling? mustn't he have been cackling? mustn't we have been cackling? mustn't you have been cackling? mustn't they have been cackling?