1.The dog is a useful animal.2.At that time,he was studying in a university.And it was a famous one.请问上面两句为什么用a不用the 我认为应该是a dog啊希望有不一样的回答另外one指什么?

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1.The dog is a useful animal.2.At that time,he was studying in a university.And it was a famous one.请问上面两句为什么用a不用the 我认为应该是a dog啊希望有不一样的回答另外one指什么?
1.The dog is a useful animal.
2.At that time,he was studying in a university.And it was a famous one.
请问上面两句为什么用a不用the 我认为应该是a dog啊希望有不一样的回答另外one指什么?

1.The dog is a useful animal.2.At that time,he was studying in a university.And it was a famous one.请问上面两句为什么用a不用the 我认为应该是a dog啊希望有不一样的回答另外one指什么?
a 是指某一种（类,个等）, the 则是特指.
第一句话里 dog 指的是这个种类,要用the 表示,后面用a 是表示狗是一种动物,只是其中的一种,有用的动物还有其他的,所以不能用the.
第二句话里,这里并不知道是哪所大学,不确定,所以要用a , 后面的 a famous one ,也只是说它是一个出名的大学,言外之意就是还有其他出名的大学,这里的one 是代词,指代的是university.

第一句的A指一种，而非特定的某种。
第二句也是指一所大学，而非特定的某一所大学。
ONE指university

1、The dog 指狗这种动物而非一只狗， a useful animal意思为一种有用的动物
2、a university 意思为一所大学，one指university

1某所大学是泛指啊
2one 指代university

one 可能指代之前的那个university第一句，a dog可以指代任何一条狗，但是the dog专门指代那一条狗，不懂的继续问哦！

1.The dog is a useful animal.句中的the表种类、类别，表示“狗”这个类别。如果此句换成：A dog is a useful animal也是正确的。
第二句中的one代表university.

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