zkusim par vet.. ale moje anglictina uz odesla do vecnych lovist, bohuzel..

One day my friend Curtis flew by helicopter around the islands because He had one job which he before had got from employer.

by helicopter se mi nelibi.. which he had before.. ale cela ta druha cast vety nema logiku..

When was strong thunderstorm and a strong wind was blowing so Curtis listened to the radio.
when there was a strong ..., Curtis was listening to radio..

In the end He fell down on one of the islands but He fortunately survived.
nepatri sem "at the end"? nevim :) predlozka BUT je odporovaci predlozka.. ty vety nejsou v zajemnem rozporu.. dal bych tam spis and..

But he was alone on an island about he didn't know nothing. So He wrote SOS on the sand and And he went to look on area around the island.
Nezacinej vetu But, viz vyse, ale napr. accidentally - nanestesti.. did not know anything.. dva zapory v jedne vete.. rekl bych spis IN THE SAND.. area around island je more :) nema to logiku

He had been walking through the jungle for an hour when he found an abandoned cottage. He was quite scared because he did not know what could be inside.
proc predminuly prubehovy cas? nestaci obyc minuly prubehovy? druha veta se zda skvela :)

For example, so there could be some cannibals or surrounding venomous insects. Finally he went inside and everything in the cottage was destroyed. In the middle of the room was the basement.
For example pryc, fuj.. There could be.. surrounding.. nevim.. divne :) Finally, carka,.. There was a basement in the middle..