Conjugação do verbo inglês SHOULD HAPPEN

Verbo regular: happen - happened - happened

Afirmação

Forma simple

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it'd happen
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Forma com V-ing

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it'd be happening
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Perfeito

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it should've happened
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Perfeito com V-ing

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it should've been happening
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Forma simple

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it shouldn't happen
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Forma com V-ing

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it shouldn't be happening
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Perfeito

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it shouldn't have happened
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Perfeito com V-ing

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it shouldn't have been happening
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Forma simple

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should it happen?
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Forma com V-ing

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should it be happening?
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Perfeito

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should it have happened?
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Perfeito com V-ing

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should it have been happening?
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Forma simple

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shouldn't it happen?
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Forma com V-ing

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shouldn't it be happening?
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Perfeito

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

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shouldn't it have been happening?
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