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No sir, every type of letter have to follow same structure, just follow this structure. 2,3,4 body paragraphs are just the elaboration of bullet points mentioned in topic. They can be about anything.
Dear sir/madam, – formal
Dear Mr/mrs first name, – in semi formal
Dear first name, – in informal
Opening line depending on types of letter, followed by purpose of writing the letter.
Bullet point 1 expansion…………….
Bullet point 2 expansion…………..
Bullet point 3 expansion……….
Closing line depending on type of letter.
Your faithfully,
First name last name
– in formal
Yours sincerely,
First name last name
– in semi formal
Take care/love/miss you/regards,
Fist name only
– in informal
And it is advised to use few abbreviations/contractions (not in every place, unlike informal) etc/eg/ie/i’ve/i’ll, i’m, she’ll, he’ll, wouldn’t, can’t and so on… in semi formal. And use contractions wherever possible in informal. But never use them
In formal