I would like to describe a person 'which' (jak mowimy o ludziach to WHO albo WHOM, NIGDY WHICH) WHOM I have known for fifteen years. 'old' (niepotr).
Karolina has dark shoulder-'lenght' LENGTH hair.
My sister is tall and 'very muscular' (chociaz to muscular nie za bardzo mi sie podoba, mam image Mariana tutaj)
She 'prefer' (ale 'she' to jest 3os.l.poj - a wtedy do czasownikow reg. dodajemy -s) to wear sports clothes like baggy trousers.
Since 2005 she's BEEN training 'a' THE long jump and 'footrace'?, because ..... SHE TAKES PART IN A relay race.
I admire her 'cause' (PROSZE nie uzywac tego slowa, napisales to blednie - prosze popraw) Karolina must be very 'vell' WELL-organized person. Every day she's got training, sometimes twice 'times' (nie, albo twice a week albo two times a week) and she has got a lot of studyING 'to' IN school. Karolina is very punctual- I TOO would like to be always on time. She has got one negative (negative co?)- she is a little nervous.
(She gets nervous very quickly, when something does not turn out the way she wants.)
I wish I were so strong and hard-working. I admire Karolina for her determination and 'optimistic' (tutaj potrzebny rzeczownik, a 'optimistic' nim nie jest). She is a very special person and I believe that she will 'achive' ACHIEVE 'everythinh' EVERYTHING 'what' (nie, to kalka z polskiego...tutaj THAT) she wants.