4 Clear and effective writing
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Using commas
Use a comma to separate a series of items that exceeds two in number:
Each subject was required to maintain a diary, complete a questionnaire, and
take part in a 15-minute interview.
A dissertation should include an abstract, an introduction, a literature review, a
methodology section, a results section, a discussion section and a conclusion.
Traditionally, a comma was seen as unnecessary before the ‘and’ that pre-
cedes the final item of the series (the technical term is a serial comma). However,
the absence of a comma can mean that the two last items in the series get
‘lumped’ together and this can be confusing for the reader, particularly in long,
more complex lists. So use your commonsense to decide if it is needed. (You will
always see the serial comma used in US-style texts.)
TIP
Use a comma and a co-ordinating conjunction (and, but, or, nor, for, yet, so) to
separate two independent clauses. An independent clause is a clause that can
stand by itself as a separate sentence:
Many people believe in the death penalty, but the government is adamant in its
refusal to pass legislation that will permit its implementation.
The second sentence could be written as two independent clauses:
(1) Many people believe in the death penalty.
(2) The government is adamant in its refusal to pass legislation that will permit
its implementation.
Here are two further examples:
He knew that Operation Barbarossa would mean a war on two fronts, yet Hitler
went ahead and ordered the invasion of Russia regardless.
The party would not elect a new leader, nor would it change its policy on what
would become a key electoral issue and one of critical national importance.
If the two independent clauses are both short and make for a fairly simple
sentence, then the comma can be omitted, for example:
He liked the idea but chose not to adopt it.
However, the safest option is to always include a comma.
TIP
Use a comma to separate, or ‘set off’ introductory information. That information
may ‘frame’ what follows it in the sentence and/or it may help link the current sen-
tence to the preceding one:
Although the majority of citizens support the idea of surveillance as a means of
increasing their personal security, civil liberties organisations are increasingly
concerned that it is whittling away the individual’s right to privacy.
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