Перед посадкой на судно я подписал

Перед посадкой на судно я подписал контракт на три месяца с устной договоренностью на продление до четырех в том случае если судно получит новый чартер

Результаты (английский) 1:

Before boarding the ship, I signed a contract for three months with an oral agreement to an extension of up to four if the vessel will have a new Charter

Результаты (английский) 2:

Before boarding the ship, I signed a contract for three months with an oral agreement to an extension of up to four in the case if the ship gets a new charter

Результаты (английский) 3:

before i got on the boat, i signed a contract for three months with a verbal agreement for the extension to four in this case, if the ship gets a new charter