Verbo regolare: ascertain - ascertained - ascertained
Affermazione
Forma semplice
I must ascertain you must ascertain he must ascertain we must ascertain you must ascertain they must ascertain
Forma con V-ing
I must be ascertaining you must be ascertaining he must be ascertaining we must be ascertaining you must be ascertaining they must be ascertaining
Perfetto
I must have ascertained you must have ascertained he must have ascertained we must have ascertained you must have ascertained they must have ascertained
Perfetto con V-ing
I must have been ascertaining you must have been ascertaining he must have been ascertaining we must have been ascertaining you must have been ascertaining they must have been ascertaining
Negazione
Forma semplice
I mustn't ascertain you mustn't ascertain he mustn't ascertain we mustn't ascertain you mustn't ascertain they mustn't ascertain
Forma con V-ing
I mustn't be ascertaining you mustn't be ascertaining he mustn't be ascertaining we mustn't be ascertaining you mustn't be ascertaining they mustn't be ascertaining
Perfetto
I mustn't have ascertained you mustn't have ascertained he mustn't have ascertained we mustn't have ascertained you mustn't have ascertained they mustn't have ascertained
Perfetto con V-ing
I mustn't have been ascertaining you mustn't have been ascertaining he mustn't have been ascertaining we mustn't have been ascertaining you mustn't have been ascertaining they mustn't have been ascertaining
Forma interrogativa
Forma semplice
must I ascertain? must you ascertain? must he ascertain? must we ascertain? must you ascertain? must they ascertain?
Forma con V-ing
must I be ascertaining? must you be ascertaining? must he be ascertaining? must we be ascertaining? must you be ascertaining? must they be ascertaining?
Perfetto
must I have ascertained? must you have ascertained? must he have ascertained? must we have ascertained? must you have ascertained? must they have ascertained?
Perfetto con V-ing
must I have been ascertaining? must you have been ascertaining? must he have been ascertaining? must we have been ascertaining? must you have been ascertaining? must they have been ascertaining?
Forma interro-negativa
Forma semplice
mustn't I ascertain? mustn't you ascertain? mustn't he ascertain? mustn't we ascertain? mustn't you ascertain? mustn't they ascertain?
Forma con V-ing
mustn't I be ascertaining? mustn't you be ascertaining? mustn't he be ascertaining? mustn't we be ascertaining? mustn't you be ascertaining? mustn't they be ascertaining?
Perfetto
mustn't I have ascertained? mustn't you have ascertained? mustn't he have ascertained? mustn't we have ascertained? mustn't you have ascertained? mustn't they have ascertained?
Perfetto con V-ing
mustn't I have been ascertaining? mustn't you have been ascertaining? mustn't he have been ascertaining? mustn't we have been ascertaining? mustn't you have been ascertaining? mustn't they have been ascertaining?