Conjugación del verbo inglés CAN HAPPEN
Verbo regular: happen - happened - happened
Afirmación
Forma simple
--
it can happen
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Forma con V-ing
--
it can be happening
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Perfecto
--
it can have happened
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Perfecto con V-ing
--
it can have been happening
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Negación
Forma simple
--
it can't happen
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Forma con V-ing
--
it can't be happening
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Perfecto
--
it can't have happened
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Perfecto con V-ing
--
it can't have been happening
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Forma interrogativa
Forma simple
--
can it happen?
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Forma con V-ing
--
can it be happening?
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Perfecto
--
can it have happened?
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Perfecto con V-ing
--
can it have been happening?
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Forma interro-negativa
Forma simple
--
can't it happen?
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Forma con V-ing
--
can't it be happening?
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Perfecto
--
can't it have happened?
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Perfecto con V-ing
--
can't it have been happening?
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