1.Conditional clauses: "When customers feel neglected, they are likely to switch to competitors who offer better service" uses a conditional clause to describe the potential outcome of ignoring customer issues, adding depth and complexity to the sentence.
2.Present participle as an adverb: "further damaging the company's reputation" uses the present participle "damaging" as an adverb to describe the impact of negative word-of-mouth, enhancing the sentence's complexity.
3.Noun phrase as subject: "negative word-of-mouth" serves as the subject of the sentence, using a complex noun phrase to describe a key concept, adding depth to the expression.
4.Causative structure: "This not only results in the loss of repeat business and loyal customers but also makes it challenging to attract new customers" uses a causative structure to describe the consequences of ignoring customer issues, demonstrating advanced grammar proficiency.