Hello birkett7,
The short answer is yes and no. Let me explain:
In spoken English, it is generally acceptable to use contractions in
English. It is also acceptable to use contractions in informal
writing.
In any formal writing however, one should not use contractions:
"Rule: Do not use the contracted form of the auxiliary in formal
writing."
Source: http://esl.about.com/library/grammar/blgr_contractions.htm
"Generally, using contractions will mean that your prose will be less
formal, perhaps more friendly. You should be aware that many people
would consider any contractions to be out of place in formal, academic
prose or technically precise text, so it would be a good idea to avoid
contractions there."
http://webster.commnet.edu/grammar/grammarlogs/grammarlogs9.htm
Please let me know if you require clarification regarding this answer
and I will do my best to further assist you.
All the best,
tisme-ga
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