When the IELTS Task says ‘write to a friend’ or 'write to your family member', the letter style is informal (in all other cases use the formal style). The informal letter must be written in the correct style — chatty and friendly.

Informal letter greetings (first 2 words of your letter)

• Dear Mike,
• Hi Mike,
• Hey Mike!

Informal letter intros

• I hope you had a great birthday/holiday; anyway, the reason I am writing is ...
• I hope things are going well. The reason I am writing is that ...
• Thanks for your kind letter and the superb photos, ...
• How are you? I hope this letter finds you well.
• I’m just writing to let you know that….
• I’m writing to tell you about….

Informal asking for smth

• I would be forever in your debt if you could...

Informal letter closings

• Please let me know if you can come, so I can plan a few surprises for you.
• Please email me if you ...
• Thanks again for ... and let me know if you ...
• I can't wait for you to come! Write soon with more details.
• Take care and write back soon.
• I'm looking forward to seeing you / to hearing from you.

Informal letter sign-offs (last words of your letter)

• Best wishes,
  Sam
• See you soon,
  Sam
• Take care of yourself,
  Sam
• I wish you all the best,
  Sam
• All the best,
  Sam