Look at the following tips for writing covering letters. For each one say if it's True or False
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informal
relaxed, friendly
slang
very informal words and language
idiomatic language
language using groups of words which have a certain meaning that is different from the ordinary meaning of each individual word e.g. 'My boss bit my head off when I was late for work' (my boss was angry and told me off)
complex
complicated, not simple