Write Letter A. Knowing how to write a letter is a fundamental skill you'll use in business, school, and personal relationships to communicate information, goodwill, or just affection. An informal letter is a letter that is written in a personal fashion.
So, just like dressing-up more formally for a special occasion, it is a good idea to 'dress-up' your words in a formal letter, too. You're not putting on fancy dress, or trying to. It was so kind of you to invite me.
I am sorry for not having written to you earlier.
Make a good choice of words especially if you are writing an apology letter or a letter to express.
How to write letters to loved ones. Rules for writing Informal letters: Write your full name and address even if it is an informal letter. It was so kind of you to invite me.