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 must not happen
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Forma con V-ing
--
it must not be happening
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Perfecto
--
it must not have happened
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Perfecto con V-ing
--
it must not 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
--
must it not happen?
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Forma con V-ing
--
must it not be happening?
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Perfecto
--
must it not have happened?
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Perfecto con V-ing
--
must it not have been happening?
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