Complete the text

• informal
• friends
• phrasal verbs
• distant
• full forms
• further contacts
• ending
• paragraph
• notes

Letters can be [ ] and semi-formal. We send informal letters to close relatives and [ ]. They have short forms of verbs, [ ], idioms. They retain a freestyle. Semi-formal letters are more strict. They are written to [ ] relatives and familiar people. They preserve the [ ] of verbs.

The structure of both types of letters is the same: the introduction, the main part in which there is a thank-you for the letter received, the subject of the letter. In the third part, three questions are asked. In the end, it needs to mention [ ] and [ ]. There is the author's signature at the end of the letter.