Conjugação do verbo inglês MUST HAPPEN

Verbo regular: happen - happened - happened

Afirmação

Forma simple

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it must happen
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Forma com V-ing

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it must be happening
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Perfeito

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it must have happened
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Perfeito com V-ing

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it must have been happening
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Forma simple

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it mustn't happen
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Forma com V-ing

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it mustn't be happening
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Perfeito

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it mustn't have happened
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Perfeito com V-ing

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it mustn't have been happening
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Forma simple

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must it happen?
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Forma com V-ing

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must it be happening?
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Perfeito

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must it have happened?
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Perfeito com V-ing

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must it have been happening?
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Forma simple

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mustn't it happen?
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Forma com V-ing

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mustn't it be happening?
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Perfeito

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mustn't it have happened?
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Perfeito com V-ing

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mustn't it have been happening?
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