What is the icse format for an informal letter?

Your p.o.Box no.

Your address

(leave a line)

Date

Dear ______(your friend's name)

First para: give an introduction about what are going to write in the letter.

(leave a line)

Second para: explain about your topic.

(leave a line)

Last para: conclusion and ask your friend some questions and also ask him/her to reply your letter that is why you write your address so that your friend could reply the letter. Your friend's address must be on the envelope.

(leave a line)

Yours Sincerely or affectionately

Your name