Tài liệu Vocabulary in Use - Upper Intermediate & Advanced

Tài liệu gồm nhiều từ ngữ bổ ích

The phrase ‘the future king’ is another
way of referring to ‘Prince Charles’
and is punctuated just like an aside.
(v) A comma separates any material that
precedes it from the main part of the
sentence:
Although she admired him, she would
never go out with him.
If you want to read the full story, buy
The Sunday Times.
Note that if the sentences are reversed
so that the main part of the sentence
comes first, the comma becomes
optional.