Error spotting (exam direction): Identify the erroneous part (A/B/C) — choose D if there is no error — 'Do you know / to play / the guitar? / No error.' Focus on the correct interrogative construction for ability ('know how to + verb') and improve the sentence for formal English and SEO clarity.

Given data

• A: Do you know
• B: to play
• C: the guitar?
• D: No error.

Concept/Approach: Interrogatives with 'know' for ability
After 'know' to ask about someone's ability to do something, English uses 'how to + base verb' (e.g., 'know how to play'). The bare 'to + verb' without 'how' is unidiomatic in this construction.

Step-by-step correction
Replace Part B: 'to play' → 'how to play'.Corrected sentence: 'Do you know how to play the guitar?'

Verification/Alternative
Other natural variants: 'Can you play the guitar?' (modal of ability) or 'Do you play the guitar?' (habit/skill).

Common pitfalls
Omitting 'how' after 'know' when expressing learned skills (play, swim, drive, code, etc.).

Final Answer
B — 'to play' is erroneous; use 'how to play'.