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His “subject” is only running around with me.&run around wit

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His “subject” is only running around with me.&run around with them
英语书中有一句His “subject” is only running around with me(他的“课程”只是在我周围乱跑.)而书中又有一句run around with them(与他们一起在周围跑)为什么一句“run”变“running”而另一句没变.
再问一下brush one’s teeth中one’s代表/意为什么还有after running中的“run”为何也用“running”
His “subject” is only running around with me.&run around wit
unning与前面的is构成be+doing 形式,有正在干什么的意思;如果去掉系动词be,run就承担谓语,所以不用动名形式.
brush one’s teeth中的one’s泛指某个主体,可直译为刷牙.