перепешите предложения, не соответствующие действительности, в отрицательной форме и дать правильный вариант

спасибо

я в 8 предложении в отрицательной форме правильно написала: I never failed examination?

нужен артикль I never failed an examination или напишите так: I never failed examinations.

но вообще, правильнее даже использовать Present Perfect: I have never failed an examination. Ведь тут речь о вашей жизни до настоящего момента

спасибо

1 Charles Darwin wasn't an American. He was an Englishman.

2 William Shakespeare didn't write 'Don Quixote'. He wrote 'Hamlet'.

3 My great-grandparents weren't bankers. They were teachers and office workers.

4 We didn't have mobile phones in the 1970s. We had them in the late 1990s (в конце 90-х).

5 My father didn't study at Oxford. He studied at Saint Petersburg State University.

6 My brother didn't study Chinese at school. He studied English.

7 I didn't take ten exams in winter. I took four exams.

8 I didn't fail (at) my last examination. I never failed an examination.

9 I didn't do my homework yesterday morning. I did my homework yesterday evening.

10 I didn't see the President of our country yesterday and I didn't speak to him. I saw the mayor of our city.