English grammar – Spot the error (choose the segment with the mistake; if there is no mistake, choose ‘‘No error’’). Sentence: “Do not trouble yourself about writing to me unless you are quite in the humour for it.”

Introduction / Context:At first glance the sentence may look unusual because of the phrase “in the humour”, which is a British-English expression equivalent to “in the mood”. Error-spotting items often include archaisms or regional variants that are still grammatically correct to test whether candidates can distinguish true errors from unfamiliar but acceptable usage.

Given Data / Assumptions:

• Imperative construction: “Do not trouble yourself … unless …”.
• Gerund phrase: “about writing to me”.
• Conditional clause: “unless you are quite in the humour for it.”

Concept / Approach:

• “Trouble yourself about …” is idiomatic and acceptable.
• “Unless” correctly introduces a negative condition.
• “In the humour” in BrE = “in the mood”; it takes the definite article “the”.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

Common Pitfalls:

Final Answer: