Помогите проверить задание, пожалуйста.

[IceShadow999]

Преподаватель говорит, что я не правильно составил вопросы, с точки зрения грамматики, а я в упор не могу понять где неправильно, помогите пожалуйста.

The new engine is being tested in the laboratory.

1) Do new engine is being tested in the laboratory?
2) How long new engine is being tested in the laboratory?
3) The new engine is being tested in the laboratory or the outside.
4) The new engine is being tested in the laboratory, isn’t it?
5) What do being tested in the laboratory?

Our regular customers are given a discount.

1) Do our regular customers are given a discount?
2) What is the discount for our regular customers?
3) Our regular customers are given a discount or don’t receive a discount?
4) Our regular customers are given a discount, don’t they?
5) What our regular customers receive?

If you listen to the teacher more attentively you’ll understand better.

1) If do you listen to the teacher more attentively you’ll understand better?
2) Why If you listen more attentively to the teacher, you will understand better?
3) If you listen to the teacher more attentively you’ll understand better or will not understand anything?
4) If you listen to the teacher more attentively you’ll understand better, isn’t it?
5) Who do you need to listen more attentively to understand better?

No one came here since we have been here.

1) Do no one came here since we have been here?
2) When no one came here we were here?
3) No one came here since we have been here or weren’t here.
4) No one came here since we have been here, isn’t it?
5) Who didn’t come here since we were here?

[Ice Shadow 999]

1.Is the new engine being tested in the laboratory? 2.How long is the new engine being tested in the laboratory? 3.Is the new engine being tested in the laboratory or outside? 4.The new engine is being tested in the laboratory, isn't it? 5.What is being tested in the laboratory?