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When do you use the comma in English?
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Practise:
Comma or no comma?

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We always use a comma when we refer to the whole main clause. Like this:




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We don't use a comma before the word that.
Remember that!

Compare Finnish and English, and don't let Finnish grammar rules fool you:

Here's the photo that I was talking about.
Tässä on se kuva, josta puhuin.