Please help ! утворіть питальне і заперечне речення. наприклад: i have been there very often- nave i been there very often? i have not been there very often. 1. the snudents have passed all their exams. 2. they have answered all the questions. 3.you have solved the problem . 4. something has happened to your friend.

1 have the students passed all their exams? The students haven't passed all their exams 2 have they answered all the questions? They haven't answered all the questions 3 have you solved the problem? You haven't solved the problem 4 has something happened to your friend? Something hasn't happened to your friend