The Conjugator
Conjugação do verbo inglês
COULD HAPPEN

Verbo regular: happen - happened - happened

Afirmação

Forma simple

Forma com V-ing

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it could happen
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it could be happening
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Perfeito

Perfeito com V-ing

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it could have happened
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it could have been happening
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Negação

Forma simple

Forma com V-ing

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it couldn't happen
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it couldn't be happening
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Perfeito

Perfeito com V-ing

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it couldn't have happened
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it couldn't have been happening
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Forma interrogativa

Forma simple

Forma com V-ing

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could it happen?
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could it be happening?
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Perfeito

Perfeito com V-ing

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could it have happened?
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could it have been happening?
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Forma interro-Negação

Forma simple

Forma com V-ing

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couldn't it happen?
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couldn't it be happening?
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Perfeito

Perfeito com V-ing

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couldn't it have happened?
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couldn't it have been happening?
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