They say that the emergence of text messaging is killing off commas, colons and apostrophes.

他们说短信的出现扼杀了逗号、冒号和省略号。

Be sure to put a comma after your closing.

务必在你的结束语后面加上一个逗号。

In a personal letter, add a comma after the greeting.

在私人信件中，在问候语后加上逗号。

Then we need a comma and then we need the perfect conditional.

然后呢，我们需要一个逗号，再然后，我们需要完成条件句。

" I never know where to put the commas and other punctuation, " he said.

“我从来不知道把逗号和其他标点符号放在哪里”。

If you miss a comma you can actually look for that comma for two weeks.

如果你漏掉了一个逗号，你可能会用两周的时间来寻找这个逗号。

Everything within the sentence until there is a comma or phrase or a clause.

句子中的所有内容都挤在了一起，直到有逗号，短语或从句。

You know, commas are hard. Even native speakers mess up with commas a lot.

逗号很难。即使本地学生也会搞混。

And then we have a comma with a clause here.

然后我们在这里有一个逗号和一个从句。

And again here, you don't have necessarily write the comma for 45000 or 1200.

这里你不用给45000或1200加逗号。