问题标题:
theyarrivehomeearly.thechildrenarrivehomeearly.hearriveshomeearly.Mr.smitharriveshomeearly.为什么前2个动词后不用加S,而后2个要加S啊往详细说明.
问题描述:

theyarrivehomeearly.

thechildrenarrivehomeearly.

hearriveshomeearly.

Mr.smitharriveshomeearly.

为什么前2个动词后不用加S,而后2个要加S啊往详细说明.

马永康回答:
  因为后面2个的主语是单数形式
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