everybody began to laugh and sing为什么laugh和sing不用过去时

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everybody began to laugh and sing为什么laugh和sing不用过去时
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everybody began to laugh and sing为什么laugh和sing不用过去时
everybody began to laugh and sing为什么laugh和sing不用过去时

everybody began to laugh and sing为什么laugh和sing不用过去时
因为不定式符号to后面要接动词原形