I'm sorry that I didn't write FOR so long. When (ale kiedy?) I was in London I watched the Summer Olimpic Games with my parents.
The Summer Olimpic Games 'was' (ale przeciez 'games' to l. mnoga, dlaczego uzywasz czasownika l. poj?) on 17 'Juny' (co to za miesiac?). The 'participants' (lepiej napisz 'competitors') were from USA, France, England and they 'had from 18 to 26 years' (BZDURY - kto tak Cie nauczyl, zmien to natychmiast i nie pokazuj swoich brakow).
In swimming 'win' (tutaj czas przeszly, bo to juz sie kiedys stalo) Tom, he got a gold medal.(to zdanie lepiej by wygladalo w stronie biernej)
'In gymnastic win Kate' (zmien to bo to mnie razi, napisz biernie).
The 'participants' (competitors) played 'great' (tutaj jest pytanie HOW did they play? They played 'well') and they 'didn't compete' (cos tutaj nie tak? nie rozumiem tego).
Thanks TO this I looked 'pleasantly' (zdanie ok, ale cos to slowo nie za bardzo) at them. I think that you 'must' SHOULD be there 'in' (napisz NEXT year.
'Looking forward to hearing from you' (to jest ZA bgardzo formalnie jak na taki list, napisz Look after yourself, Best wishes, Regards).