Our question this week relates to two similar words, older and elder. They are both to do with comparing ages. For example when comparing two objects the older one is the one that has been around the longest. However we can only use the word elder when comparing people who are related so for example, the elder brother in a family is the one who was born first.

There is also the word oldest which means the thing or person of the greatest age. And the eldest member of the family is the person who's been alive the longest.

Join Rob and Feifei in Question and Answer of the Week as they talk more about this and explain the idiom 'the oldest trick in the book.'

Do you have a question about learning English? 你有沒有英語學(xué)習(xí)上的問題？

Then email us at questions.chinaelt@bbc.co.uk