Nowadays, there is a tendency 'to moving' (tu troche sobie pomieszales - albo 'to move' albo 'of moving') to the big city. Many 'adult people' (mozna tez 'adults') decide to do that in order to find a lucrative job and have everything 'what' (kalka z polskiego 'co' ale tutaj pasuje 'that') they need. However (daj tutaj przecinek,) it is very important to think about children and 'its' (nie, bo jak masz 'children'-l. mnoga, to tutaj tez musi byc l. mn- 'their') upbringing. Let us consider whether it is good for (brak przedimka) children to move to a big city.
First and foremost, living in a big city ensures (tu brakuje 'that') children (tu brakuje slowa) better education opportunities. Young people can choose where they want to attend nursery school, primary school,(nie za bardzo, bo 'dzieci' w tym wieku nie maja nic do powiedzenia - tutaj musisz napisac, ze to 'rodzice maja wybor') secondary school and college. What is more, a big city is generally believed to provide young people (brakuje 'with') more places where they can play, spend time with friends(,) (nie dawaj przecinka jak masz tylko jedno wiecej. Tutaj dodaj 'and') develop. There are more hobby clubs, cinemas, theaters, events and 'clubs thus' (cos mi to nie wyglada najlepiej, moze...clubs and thus...), children are not bored and discouraged and can develop their interests. Moreover, it is often believed that when teenagers graduate a college or even a secondary school THEY are more likely to find a job and may easily buy or rent an apartment.
It is generally agreed that the crime rate is higher in the big city and it is more 'probably' (zle slowo, tutaj 'probable' albo 'likely') that young men will be a victim of crime or will mix with the wrong people. Also, air pollution is higher (tutaj musisz napisac gdzie) which may cause many diseases.
To sum up, living in a big city 'haves' (nie, miales na mysli 'has' ) many pros and cons and is (przedimek) very important case so everyone should decide where want to live and what will be good for 'his' (ja dalabym 'their' bo moze tez kobieta decydowac, a wtedy 'her') child.