Conjugación del verbo inglés MUST HAPPEN
Verbo regular: happen - happened - happened
Afirmación
Forma simple
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it
must happen
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Forma con V-ing
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it
must be happen
ing-
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Perfecto
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it
must have happen
ed-
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Perfecto con V-ing
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it
must have been happen
ing-
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Negación
Forma simple
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it
mustn't happen
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Forma con V-ing
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it
mustn't be happen
ing-
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Perfecto
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it
mustn't have happen
ed-
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Perfecto con V-ing
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it
mustn't have been happen
ing-
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Forma interrogativa
Forma simple
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must it happen?
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Forma con V-ing
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must it be happen
ing?
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Perfecto
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must it have happen
ed?
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Perfecto con V-ing
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must it have been happen
ing?
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Forma interro-negativa
Forma simple
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mustn't it happen?
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Forma con V-ing
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mustn't it be happen
ing?
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Perfecto
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mustn't it have happen
ed?
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Perfecto con V-ing
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mustn't it have been happen
ing?
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