It's good to have an Oxford English dictionary when doing writing work because of the following reasons.First of all,when you are writing something,and you suddenly forget how to spell a word,you can take out your dictionary and look it up.Secondly,if you simply can't remember how certain words are use,or the diffences among words with similar meanings,such as look,watch,and see,you can always find them out inside an English dictionary.Last but not least,you can look up for different expressions of a word to furnish your essay,so that it is interesting to read.
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