5jj has given you the correct version of the sentence. Please look at the amendments I have made to your post, and remember the rules of written English:
Originally Posted by NABADIP CHAKRAVARTY
- Start every sentence with a capital letter.
- End every sentence with a single punctuation mark.
- Always capitalise the word "I".
- Always capitalise proper nouns (Monday, English, India, November etc).
"Dear Sir" is fine if you are writing a formal letter to a man. It is not appropriate in this forum.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.