In the General Training Writing Module, task 1 is to write a letter. The task rubric will pose a problem or describe a situation and you have to write a letter in response. You may be asked to write an informal letter to a friend or a family member or a formal letter to an official or a stranger. The task rubric will typically have three bullet points. They indicate what you should include in the letter.
For an archive of all the IELTS letters on this blog, visit the links given below.
