10) They were dancing till the dawn on Friday.

Grammar Explanation:

The phrase 'till the dawn' is grammatically correct. However, 'until dawn' or 'all night' are more common and natural-sounding alternatives in modern English when referring to a duration of time until morning.

Options:

• Option 1 (Most common): They were dancing until dawn on Friday.
• Option 2 (Slightly different emphasis): They were dancing all night on Friday.
• Option 3 (Keeping original phrase): They were dancing till the dawn on Friday. (Grammatically acceptable but less common).

Answer: They were dancing until dawn on Friday.