the students on vacation are having a good time

问题描述:

the students on vacation are having a good time
这句话是对的吗,如果是对的,那 the students on vacation是什么句型呢,如果是 定语从句,应该改为 the students who are on vacation吧,

the students on vacation are having a good time这句话是正确的.
the students主语
on vacation介词短语,作定语.(who are) on vacation 是定语从句.
are having谓语
a good time宾语
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