It is necessary in academic writing but it all depends on the context. In informal text you wouldn't use it that often, but in formal or academic writing it is nigh obligatory.
28 november 2014
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Sure. It makes writing appear more formal and academic.
28 november 2014
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!