l saw( )thief on( )way to school and( )thief was stealing a purse

l saw( )thief on( )way to school and( )thief was stealing a purse
l saw( )thief on( )way to school and( )thief was stealing a purse

l saw( )thief on( )way to school and( )thief was stealing a purse
a
the
the
我在上学的路上看到了一个小偷 他正在偷钱包

a , my/the , the

a 一个小偷 the 在回家的路上 the 特指上文提到的那个小偷

a the the
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a, the, the

a the the

a， the，the
看见一个贼 泛指
在我去学校的路上 特指
这个贼在偷钱包 特指