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

Question

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 1

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.

Answer 2

Grammatical explanation is this は in your sentence is a topic marker, this に is used as a postpositional particle which indicate place and this には is a compound word of に and は and this は is emphasis.

If you use は as a topic marker, the meaning of the sentence 1 and 2 is almost same but if you can use は as contrast and emphasis, the sentence 1 and 3 have the meaning.