Well, we use commas every three digits to split up the number and make it easier.

我们通常每三位数一分位，这样就可以把大数字简化。

Here we have several sentences incorrectly joined by commas.

这里有几个误用逗号连接的句子。

The speech marks are above the line. They go outside all other marks like commas (, ) full stops (.).

引号位于一行之上。它们应在句尾其他标点符号，如逗号（，），句号（。）之后。

Only direct speech should go inside inverted commas.

只有直接引语应放在引号内。

The manager showed us to our 'luxury apartment', in inverted commas.

经理带我们去看了我们所谓的“豪华单元”。

Commas are never used.

永远都不要使用逗号。