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Someone told me that it's wrong to start a sentence with the word "Because", e.g.

Because it is raining, you shouldn't go out.

But it's OK to say

Since it is raining, you shouldn't go out.

Is it true? If yes, why is it so?

Thanks.

Ricky
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Sorry, Ricky, you were told incorrectly. Your sample sentence starting with "Because" is just fine.

Here is an example of what you should avoid: I don't like it here. Because it's cold.
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G.G. is correct. One note I would add, however. If the "because" clause comes after the main clause, there is no comma needed. Not a logical rule - just a convention.