Based on your query, I recommend using Smodin as it offers an AI-powered essay grader feature. This tool can grade essays based on specified marking criteria such as use of language, depth of thought, and originality. This feature can be particularly useful in identifying incorrect sentences in student essays, saving you time and providing consistent feedback.

Additionally, Smodin also offers a plagiarism detection tool which can help you identify instances of plagiarism in student work, ensuring the authenticity of their submissions.

Remember, while Smodin is a powerful tool, it's always important to review the AI's suggestions as it may not be fully reliable in every instance.