Conjugação do verbo inglês COULD HAPPEN
Verbo regular: happen - happened - happened
Afirmação
Forma simple
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it
could happen
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Forma com V-ing
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it
could be happen
ing-
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Perfeito
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it
could have happen
ed-
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Perfeito com V-ing
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it
could have been happen
ing-
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Negação
Forma simple
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it
couldn't happen
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Forma com V-ing
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it
couldn't be happen
ing-
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Perfeito
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it
couldn't have happen
ed-
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Perfeito com V-ing
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it
couldn't have been happen
ing-
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Forma interrogativa
Forma simple
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could it happen?
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Forma com V-ing
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could it be happen
ing?
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Perfeito
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could it have happen
ed?
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Perfeito com V-ing
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could it have been happen
ing?
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Forma interro-Negação
Forma simple
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couldn't it happen?
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Forma com V-ing
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couldn't it be happen
ing?
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Perfeito
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couldn't it have happen
ed?
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Perfeito com V-ing
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couldn't it have been happen
ing?
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