the:
特指某些人或物：
1.彼此双方都明白Don’t tell him the news.They will meet at the school gate.
2.前面提过人或物
3.序数词前紧紧挨
4.形容词的最高级
5.乐器各种头上戴
6独一无二宇宙间
7.普通组成的专有名词the Great Wall
8.特指某（些）人或事物The bike under the tree is mine.
9.巧学妙用记得快by the way
a / an :
1.用於可数名词单数前,表示某一类人或事物.
This is a ruler.He’s a student.
2.指人或事物,但不具体说明何人或何物.
There are seven days in a week.We have three meals a day.
3.表示“一个”,但数的概念没有one强.
There’s a tree on the hill.He has an interesting book.
4.指某类人或事物中的任何一个.
An elephant is bigger than a horse.A car runs faster than a bike.
5.用於某些固定片语中.
a lot of a bithave a resthave a colda kind ofa piece ofhave a good time
6.首次提到的人或物.
不用：
1．专有名词和不可数名词： China,Class One如特指可与冠词连用.
2．泛指的复数名词前:Books are my best friend.
3．在星期、月份、季节、节日前
4．一日三餐、球类、学科、语言名词前
5．职务、头衔、称呼前:Doctor,I am not feeling well.
6．名词前已有指示代词、物主代词或不定冠词时
7．在某些固定短语中
因为 Fudan University 是专有名词,是上海的复旦大学专有的大学名字.即使分校也不能用the