Ответ:
2.I'm not sure you will have a nice time there.
(можно и по-другому, если это не будет ошибкой "I'm sure you won't have a nice time there.)
3.The seller won't send the goods to the customer in a day.
4.We won't visit the farm in July. (оно уже отрицательное)
5.I won't be careful with money.
6.They won't arrange a visit to some places of interest.
7.Our country won't have professional armed forces.
8.Their guests won't have lunch after the walk. (уже отрицательное)
9.We won't watch this documentary with great interest. (уже отрицательное)
10.A lady won't always be mysterious for a gentleman.
думаю, я правильно поняла задание.