当我18岁的时候就开始在上海做生意了

问题描述：

这个句子用英文怎么写？

问题解答：

I started doing business in Shanghai when I was only 18 （years old 可省略）

I Set out my business in Shanghai when I was 18 years old

I have been doing business in Shanghai since I was only 18 years old.

I have been business in shanghai since i was 18(years old.
I did business in shanghai when i was 18 (years old).

When I be 18 years old of time the beginning did business in Shanghai