Verbo regular: strengthen - strengthened - strengthened
Afirmación
Forma simple
I must strengthen you must strengthen she must strengthen we must strengthen you must strengthen they must strengthen
Forma con V-ing
I must be strengthening you must be strengthening she must be strengthening we must be strengthening you must be strengthening they must be strengthening
Perfecto
I must have strengthened you must have strengthened she must have strengthened we must have strengthened you must have strengthened they must have strengthened
Perfecto con V-ing
I must have been strengthening you must have been strengthening she must have been strengthening we must have been strengthening you must have been strengthening they must have been strengthening
Negación
Forma simple
I mustn't strengthen you mustn't strengthen she mustn't strengthen we mustn't strengthen you mustn't strengthen they mustn't strengthen
Forma con V-ing
I mustn't be strengthening you mustn't be strengthening she mustn't be strengthening we mustn't be strengthening you mustn't be strengthening they mustn't be strengthening
Perfecto
I mustn't have strengthened you mustn't have strengthened she mustn't have strengthened we mustn't have strengthened you mustn't have strengthened they mustn't have strengthened
Perfecto con V-ing
I mustn't have been strengthening you mustn't have been strengthening she mustn't have been strengthening we mustn't have been strengthening you mustn't have been strengthening they mustn't have been strengthening
Forma interrogativa
Forma simple
must I strengthen? must you strengthen? must she strengthen? must we strengthen? must you strengthen? must they strengthen?
Forma con V-ing
must I be strengthening? must you be strengthening? must she be strengthening? must we be strengthening? must you be strengthening? must they be strengthening?
Perfecto
must I have strengthened? must you have strengthened? must she have strengthened? must we have strengthened? must you have strengthened? must they have strengthened?
Perfecto con V-ing
must I have been strengthening? must you have been strengthening? must she have been strengthening? must we have been strengthening? must you have been strengthening? must they have been strengthening?
Forma interro-negativa
Forma simple
mustn't I strengthen? mustn't you strengthen? mustn't she strengthen? mustn't we strengthen? mustn't you strengthen? mustn't they strengthen?
Forma con V-ing
mustn't I be strengthening? mustn't you be strengthening? mustn't she be strengthening? mustn't we be strengthening? mustn't you be strengthening? mustn't they be strengthening?
Perfecto
mustn't I have strengthened? mustn't you have strengthened? mustn't she have strengthened? mustn't we have strengthened? mustn't you have strengthened? mustn't they have strengthened?
Perfecto con V-ing
mustn't I have been strengthening? mustn't you have been strengthening? mustn't she have been strengthening? mustn't we have been strengthening? mustn't you have been strengthening? mustn't they have been strengthening?