Dear Sir or Madam,
I am writing in response to your advertisement which appeared in the yesterday's issue of 'The Clock' and I am interested in working as an instructor and tutor of teenagers.
I am 18 years old and I attend a high school in London. I have experience of care for children, because for the last summer I have been involved in taking care of children. This gave me a lot of experience of working with different kinds of children and teenagers.
As my references show, I am responsible and patient person.
I am interested in this work, because I want earn some money. Furthermore I like teenagers, so this job will be pleasure for me.
I look forward to hearing form you soon.