I am writing in response to your advertisement posted on…
I refer to your advertisement in…dated…
I would like to apply for the position of…
I have a lot of experience in working with children...
I am the right person for this job, because...
My strengths are…
I would say that my only weakness / weaknesses are… . But I am looking to improve in this / these area/s.
I would be well suited to the position because…
I would welcome the opportunity to discuss further details of the position with you personally.