Start Proficient More definitions How difficult was this activity? Too hard Practise using different forms of the same word How difficult was this activity? Too hard Try these activities next Proficient Cover letter Learn some of the formal language you'll need when you apply for a job Proficient Formal and informal writing This writing activity practises the appropriate register. Choose whether the phrase is used in formal or informal writing. Proficient Complaining politely and appropriately Read an extract from some letters of complaint. Use this writing activity to practise if the language of complaining is polite and appropriate, or not.