Someone I work with in an ESL setting is using "It's because..." to begin his sentences and I believe it doesn't sound natural. I am aware that he should be using 'because' to join the sentences but for argument sake I want to know if it is grammatically correct to begin a sentence with "It's because".

An example:

I want to become a fireman.

It's because I want to help people who are in need.


I think students should use eletronic dictionaries. It's because they are more convenient.

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    What reason do you have for asserting that it doesn't sound natural? Have you Googled the term, or consulted corpuses of English usage? – Erik Kowal Jan 28 '15 at 5:08
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    The sentences in question are grammatically correct, and convey the proper meaning. That said, using it all the time might be a bit much. One may begin a sentence with practically any word or phrase and manage to make it correct in a grammatical sense. – SrJoven Jan 28 '15 at 5:35
  • While they are correct, when written (as opposed to spoken) the examples appear to end rather abruptly. "I want to become a fireman because..." or "It's because I want to help people in need that I want to become a fireman" or even just doing the "It's because" seem more fluent to me. – Chris H Jan 28 '15 at 11:15

The sentence "it's because..." is grammatically correct. The pronoun it refers to the preceding sentence, "I want to become a fireman". Using substitution, we get "I want to become a fireman because...". It isn't necessarily the most fluid or succinct method of writing, but it isn't wrong either.

Of course, it's important to ensure the referent for "it" is clear, as always.

I agree splitting the single thought process into two sentences seems a little unnatural. However, there are cases where it makes sense. One example is after a rhetorical question, with a full stop for dramatic effect:

Why do we take air for granted?
It's because...

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Proper grammar would be "I would like to become a fireman because...". Sometimes if you're stuck with how to word a sentence try flipping it around!

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    This doesn't really answer the question at hand, which asks about the grammaticallity of starting a sentence with "it is because". – Matt E. Эллен Jan 28 '15 at 8:33

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