1.Causal conjunction: "The flexibility associated with remote work has contributed significantly to the trend of working extra hours" uses the causal conjunction "has contributed" to explain the reason behind the trend, demonstrating a complex sentence structure.
2.Relative clause: "The distinction between work and personal life becomes less clear when working from home" uses a relative clause "when working from home" to provide additional information, enhancing the complexity of the sentence.
3.Present participle phrase: "making it easier for employees to extend their work hours" uses a present participle phrase to describe the result of the previous action, adding depth to the sentence.
4.Noun phrase as subject: "This shift in work culture" serves as the subject of the sentence, using a complex noun phrase to describe a trend, showcasing advanced grammar skills.