Вопрос по английскому языку:

Помогите с английской грамматикой, а именно 5 типов вопросов, пожалуйста!!
Проверьте правильность вопросов.

1. Is the speech of any person a mixture of social and geographical features?
2. Have the variants 'clim', 'clum' and 'clome" geographical and social patterns or economic patterns?
3. What may reveal something about the social or regional background
of speakers?
4. The dollar was the currency of Germany and Spain for over two centuries, was not it?
5. The American word 'o'kay' abbreviated to two letters 'OK', is not one of those coinages that testify to the enormous influence of Americanisms on the standard British usage, is it?