Sentence improvement (question tag and auxiliary–main verb order): fix inversion and agreement in a tag question Original sentence: "If you are thinking about investigation overseas, isn't it makes sense to find an experience guide?" Choose the best correction that makes the tag question grammatical and natural.

Given data

• Main clause idea: “It … make(s) sense.”
• Erroneous tag in the original: “isn’t it makes …” (double marking with is + makes).

Concept/Approach
For present simple with lexical verbs, the auxiliary do/does carries negation and inversion in tag-like confirmations: “doesn’t it make sense?” The main verb must be in the base form after the auxiliary.

Step-by-step correction
Replace “isn’t it makes” → doesn’t it make.Also note spelling/word choice issues: “an experienced guide,” not “experience guide” (vocabulary point; not examined in options).

Option analysis
doesn’t it make — correct auxiliary, negation, inversion, and base verb. ✅does it make — lacks the confirming negative tag sense present in the original.is it making, it is not making — wrong auxiliary (be) and aspect for “make sense.”No correction required — the original is ungrammatical.

Common pitfalls

• Using be instead of do/does in present-simple tags.
• Keeping “makes” after an auxiliary; the main verb must be bare infinitive.

Final Answer
doesn’t it make