Answer:
he doesn't study hard is the negative form.
Answer: 11.
Explanation: I think it's talking about 4 years earlier so then she was 7. 4 years later she'd be 11 and Darren would be 7.
Answer:
Yes, it is true that all languages have grammar system.
Explanation:
All languages have a grammar, and native speakers of a language have internalized the rule's of that languages grammar.
