-For writing to people you know.
Friends, family, reactions on social media
-Abbreviations are allowed, but not advised to use in exams.
Whereas in a formal letter you have to write formally (makes sense), you are allowed to use simple and more informal language in a formal writing piece.
Let's practice:
Respond to the letter in about 10 sentences.
-Write about your life now.
-two things that you've done since last meeting Sam.