Где тут ошибка? it was one of the happiest day in my life. --Have you got any blouses? --yes, we have got white/ Hoq

It was one of the happiest days in my life. Day – должно быть множественно число, а не единственное.

How long does it take you to wash up? Неправильно построен вопрос.

Will she be busy next week? - No, she won’t. В вопросе пропущен глагол to be.

I think that I will be at the stadium at 2 o’clock tomorrow. Пропущен глагол to be.

What film did he see yesterday? Неправильно выбран вспомогательный глагол в Past Simple.