Напишите предложения в вопросительной и отрицательной форме. переведите предложения на язык. 1. twice a year students have vacations. 2. the first-year students study general engineering subjects. 3. the dean will send the students to a big plant in summer.

1) When have students vacations?
Twice a year students haven't vacations.
2) Which subjects do students study the first-year?
The first-year students not study general engineering subjects.
3) Will the Dean send the students to a big plant in summer?
The Dean won't send the students to a big plant in summer.