7. Is he live in Liverpool?

Mistake Correction:

The original sentence is 'Is he live in Liverpool?'

1. Mistake: When forming a question with 'Is' for the third-person singular, the main verb should be in the present participle form (ending in -ing) for the present continuous tense, or the auxiliary 'Does' should be used with the base form of the verb for the present simple tense.
2. Correction: The question should either be 'Does he live in Liverpool?' or 'Is he living in Liverpool?'. Given the structure, it's more likely intended as a simple present question.

Corrected sentence: Does he live in Liverpool?