Final answer:
To write an informal letter to your friend, start with a casual greeting, share recent updates, ask about their life, and close with a desire to catch up soon.
Step-by-step explanation:
To write an informal letter to your friend, start by addressing your friend with a casual greeting, such as 'Hey' or 'Hi.' Then, share what you've been up to lately, including any interesting events, hobbies, or experiences. Next, ask about your friend's life and show interest in their well-being. Finally, close the letter by expressing your desire to catch up soon and sending your regards.
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