"I'm a middle school student and I want to know the different between 'all' and 'all of'. Thanks."
TANG.LING
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Of all the questions we have received all of these years, this is the first time someone has raised a question about the word 'all'.
Yang Li takes you through an interesting lesson all by herself. She will challenge you all with some questions to make sure you have got all the tips she offers - all for free!
If you have a question you'd like us to answer, you can write to us or email: questions.chinaelt@bbc.co.uk
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