Нужно переделать 5 предложений используя кондишиналы.

1 Be here in ten minutes or else i will catch the train without you.

2 I can not help you because i have a lot of work.

3 You must study hard, otherwise you will not get into the university you want.

4 The ferry stops in very poor weather conditions.

5 l will lend you my surf board but you must return it after the weekend