At that moment ,everybody began to laugh and sing .新概念第二册第九课的一句话.从began可以看出是一般过去时,为什么laugh和sing 不用过去式.

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At that moment ,everybody began to laugh and sing .新概念第二册第九课的一句话.从began可以看出是一般过去时,为什么laugh和sing 不用过去式.
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At that moment ,everybody began to laugh and sing .新概念第二册第九课的一句话.从began可以看出是一般过去时,为什么laugh和sing 不用过去式.
At that moment ,everybody began to laugh and sing .
新概念第二册第九课的一句话.从began可以看出是一般过去时,为什么laugh和sing 不用过去式.

At that moment ,everybody began to laugh and sing .新概念第二册第九课的一句话.从began可以看出是一般过去时,为什么laugh和sing 不用过去式.
为你解答.
有一个固定用法 begin to do sth "do" 所以就要用动词原形的
求采纳 不懂追问

At that time, everyone started laughing and singing.