grammar - は、には、に。。。what is the difference between them?

Can anyone explain the difference between the three sentences below and also the use of the grammar?

1. 
   

   わたしのがっこう　は　日本人の　せんせい　が　います。

   
   



2. 
   

   わたしのがっこう　に　日本人の　せんせい　が　います。

   
   


3. 
   

   わたしのがっこう　には　日本人の　せんせい　が　います。

   
   

Answer

Simply speaking, for this example, は emphasizes the topic of the sentence,　に emphasizes the concept of location, and　には emphasizes the location as the topic.

Translating your three examples, which correspond to は,　に, and には, we get:

1. On the topic of my school (がっこう　は), there is a Japanese teacher.


2. At my school (がっこう　に), there is a Japanese teacher.


3. On the topic of (the location that is) at my school (がっこう　には), there is a Japanese teacher.

All three are grammatically correct, but have slightly different nuances to them.