I would describe my native language (Persian) as flexible. Persian grammar has been highly simplified as it has evolved throughout different periods of history.

1. Persian does not have masculine or feminine nouns. There is no gender in Persian whatsoever.

2. Persian does not have noun declensions. Even though historically, Persian did have noun declensions.

3. Persian does not have word order. Even though previously, word order did exist in Persian to some extent.

4. Persian is an Indo-European language but it is flexible when it comes to assimilating loan words or word constructions from Altaic and Semitic families of languages.

I have a theory that languages spoken for a long period of time and in a vast geographic area by a large number of people tend to become easier grammatically because of a principle that I call "least effort". I think the same has happened to English. Languages that are spoken by a large population of people from different backgrounds but fail to be flexible will be divided into different languages. Just like what has happened to Latin. The more flexible a language is, the higher is the chance that it survives.

Japanese have many onomatopoeia and mimetic words. I can't explain them in English.

Any languages in the world sounds music to me.The interesting thing is that Japan is a long island to the north from the south and the sounding of Japanese are a little bit different especially as for old local songs. The folk songs in the northern part of Japan sounds like Russian. The Southern songs sounds like Hawaiian. 

Thanks for this topic, Sarah.

Some-one new,

If you have neither declensions, nor word order, then how do you distinct who rules, and who is ruled? Prepositions?