Answer: your address
today's date
your friend name
one line gap
I received yours sweet letter in time. You wanted to know the importance of learning English. Now I am writing about it in short. English is important in numerous ways. English is a international language. It is spoken in all over the world. It is very useful to gat good jobs like pilot, doctor,tourist guide etc international business and communication also need English. A student must know English for higher studies. To operate Computer, English is a must. We can't think globalisation without English. So in a word, it can be said that English is a very important for us.
No more today. Give my best regards to your parents.
yours truly,
(your sign)
(your name)
I hope this helps, different schools have different letter writings some don't put sign etc. so do as your school says. :)