Error Spotting (Grammar) — choose the part that contains a grammatical error. If the sentence is correct, choose ‘‘No error.’’ Complete sentence: I am contacting you sometime in next week to explain to you my problem in detail.

Introduction / Context:
This tests idiomatic time expressions with ‘‘next/last’’ and the use of ‘‘in’’ with weeks. English normally omits a preposition before ‘‘next week.’’

Given Data / Assumptions:

• Planned future arrangement: present progressive is acceptable (‘‘I am contacting …’’).
• The phrase ‘‘in next week’’ appears.

Concept / Approach:
Use ‘‘sometime next week’’ (no preposition). ‘‘In the next week’’ is also possible but has a slightly different meaning (within the coming week, often with a deadline). Here the best fix is to drop ‘‘in.’’

Step-by-Step Solution:
Identify the non-idiomatic segment: ‘‘in next week.’’Remove the preposition: ‘‘sometime next week.’’Revised sentence: ‘‘I am contacting you sometime next week to explain to you my problem in detail.’’

Verification / Alternative check:
Compare: ‘‘I will contact you sometime next week’’ (also correct). With a scheduled plan, present progressive is fine.

Why Other Options Are Wrong:

• ‘‘I am contacting you’’ — acceptable for a planned arrangement.
• ‘‘to explain to you’’ — slightly verbose but grammatical; could be ‘‘to explain’’ or ‘‘to explain my problem to you.’’
• ‘‘my problem in detail.’’ — correct object phrase.
• ‘‘No error.’’ — incorrect because part B contains a phrase-level error.

Common Pitfalls:
Adding unnecessary prepositions before ‘‘next/last + time word’’ (e.g., ‘‘in next week,’’ ‘‘on last Monday’’).

Final Answer:
sometime in next week