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