Error spotting (exam direction): Identify the erroneous part — choose D if there is no error — 'You will come / to my party tomorrow, / isn't it? / No error.'

Given sentence parts (A–D)
A. You will comeB. to my party tomorrow,C. isn't it?D. No error.

Concept/Approach (question tags)
Question tags mirror the auxiliary and polarity of the main clause. With 'You will come …', the tag must be negative with the same auxiliary: 'won't you?'

Step-by-step correction
1) Replace 'isn't it?' → 'won't you?'2) Correct: 'You will come to my party tomorrow, won't you?'

Common pitfalls
Using 'isn't it' as a universal tag regardless of the main verb.

Final Answer
C — the correct tag is 'won't you?'