Vault seed record

Good at solving problems

My sister is really good ___ solving problems.

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Classification

reviewed-seedapprovedcore-grammar-controlpreposition-pattern-gapgap-fillB2Grammar

Provenance

Kind: human-authored

Source: reviewed-expansion-anchor-pack

Batch: reviewed-expansion-core-grammar-control-2026-05

Reviewer: content-lead

Updated: 2026-05-21

Instruction and answer

Instruction

Choose the best answer.

Correct answer

at

Explanation

The adjective pattern is good at plus an -ing form.

Product use

Surfaces

testfunneldaily

Source languages

globalrueszh

Difficulty

medium

Conversion hook

One small preposition makes the phrase sound automatic.

Review payload

Review notes

Approved seed anchor from the reviewed expansion pack. Used to close family coverage gaps before scaled promotion.

Media prompt

No media prompt attached.

Assets

preposition-micro-scenestranslated-phrase-distractorsarticle-noun-contexts

Source traps

global-collocation-transferru-article-omissionru-word-order-questionzh-tense-aspect

Tags

grammarreviewed-expansionprepositionsadjective-patterns

Usage

Tests: grammar-diagnostic, general-english-level, error-detection

Funnels: general-level-assessment

Challenges: grammar-anchor-03

{
  "type": "single-choice",
  "correctOptionId": "at",
  "options": [
    {
      "id": "at",
      "label": "at",
      "rationale": "This is the defensible answer in the context."
    },
    {
      "id": "in",
      "label": "in",
      "rationale": "This distractor reflects a common learner mistake."
    },
    {
      "id": "on",
      "label": "on",
      "rationale": "This distractor reflects a common learner mistake."
    },
    {
      "id": "with",
      "label": "with",
      "rationale": "This distractor reflects a common learner mistake."
    }
  ]
}