YOU SAID:

I am going to the stock market to do a business because I am an adult.

INTO JAPANESE

私は大人だからビジネスをするために株式市場に行きます。

BACK INTO ENGLISH

I'm an adult and go to the stock market to do business.

INTO JAPANESE

私は大人で、株式市場に行ってビジネスをしています。

BACK INTO ENGLISH

I am an adult, going to the stock market and doing business.

INTO JAPANESE

私は大人で、株式市場に行ってビジネスをしています。

BACK INTO ENGLISH

I am an adult, going to the stock market and doing business.