Representing when, where, how and why
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Students' problems | page 11 of 12 |
It is because
Students overuse it is because in many situations where it is unnecessary or
incorrect 
:
Causeway Bay at 7:00 pm is very busy. If you want to go shopping, I think you will be very unhappy. It is because you can only see people and not any goods. (TeleNex Students)
Firstly, this is incorrect, because if a pronoun is used, it should be this to refer to the preceding clause I think you will be very unhappy.
Secondly, the phrase this is because is emphatic and not necessary in contexts
like this. Two sentences can be made into one by using a subordinate
clause 
with because:
Causeway Bay at 7:00 pm is very busy. If you want to go shopping, I think you will be very unhappy because you can only see people and not any goods.
For further information about because and it is because, see 
Representing when, where, how and why: Representing why (p 3).
For further information about it is because and this is because, see Representing when, where, how and why: Representing why (p 4).
For further information about using because in subordinate clauses, see Linking clauses by subordination: Expressing reason.
Introduction
It is because
