亚洲91视频,国产91网,久久久久久久久久久久久久久国产,亚洲一区二区三区日本久久九,亚洲日本久久,国产精品久久久99,亚洲欧美一区二

Do you know the differences between 'begin to do something' and 'being doing something'?

Which of these sentences is correct?

'I began to learn Chinese when I was 15.'

'I began learning Chinese when I was 15.'

Find out the answer in this Q&A programme.

If you have a question you'd like us to answer, you can write to us or email: questions.chinaelt@bbc.co.uk