Formal or Informal? Sort the Letter Phrases – part 2

Formal or informal?

Would you write this to a hotel manager or to your best friend? Drag each card into the right box.
Formal
By the way, did you watch the match on Saturday?
Anyway, the reason I'm writing is to ask you a favour.
I would be grateful if you could send me a brochure.
Could you please let me know whether breakfast is included?
Please find my CV attached.
Can you send me some photos?
Why don't you come and stay with us in July?
I would like to complain about the service I received.
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Informal
Tip: formal letters use full forms and set phrases, informal letters sound like talking.

Every card here belongs to either a formal letter or an informal one. Drag it into the right box: a card dropped in the wrong box comes back, so each round ends with a correct sort. Round 1 is about starting a letter, round 2 about the main part and round 3 about endings.

Formal letters use full forms (I am, I would), polite set phrases and no slang. Informal letters sound like talking: contractions, questions to the reader and phrases like Guess what? or By the way.

Leave it if you want an answer.