"a story"

It was a warm summer day when Sally sat under a big tree next to house. She lived in the countryside. Sally wanted to write a story for a competition in the school magazine. Suddenly she heard her horse, it made a strange noise.
After that Mr. Thomas, Sally's theacher, gave her a first prize for the story competition. She felt really happy beacause she was the winner.

It was a warm summer day when Sally sat under a big tree next to (cos brak) house.
Suddenly (ja tutaj lubie widziec przecinek,) she heard her horse, it made a strange noise.
After that Mr. Thomas, Sally's 'theacher' (ortog), gave her 'a' (daj tutaj THE) first prize for the story competition. She felt really happy 'beacause' (hello - co to za slowo?) she was the winner.