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

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• At that moment ,everybody began to laugh and sing .
• everybody began to laugh and sing为什么laugh和sing不用过去时
• At that moment,everybody began to laugh and sing同义句、、快些嗯.
• everybody began to laugh and sing 中的began 是及物动词还是不及物动词?
• everybody began to laugh and sing.为什么后面不是过去时?
• At that moment ,everybody began to laugh and sing .
• At that moment,everybody began to laugh and sing同义句、、快些嗯.