"Be skilful in" 是一个英语短语，用来描述某人在某个领域或某项技能上具有高超的技艺或熟练的能力。这个短语强调的是通过学习、实践和经验积累而获得的技巧或能力。在句子中，"be skilful in" 通常用作谓语，后面接名词或动名词来表示具体的技能或领域。

**用法示例**

1. **一般现在时**

   - He is skilful in playing the piano, which always amazes the audience. (他在钢琴演奏上很有天赋，总是能震撼观众。)

   - She is skilful in coding and often helps her colleagues with difficult programming tasks. (她在编程方面很擅长，经常帮助同事解决复杂的编程问题。)

2. **一般过去时**

   - After years of practice, he became skilful in public speaking. (经过多年的练习，他变得擅长公开演讲。)

   - They were skilful in negotiating deals, resulting in numerous successful partnerships. (他们在谈判交易方面很在行，因此建立了许多成功的合作关系。)

3. **一般将来时**

   - With continuous effort, she will be skilful in cooking various cuisines soon. (通过不断努力，她很快就会擅长烹饪各种菜肴。)

   - By attending more workshops, they'll be skilful in managing their team effectively. (通过参加更多的研讨会，他们将在有效管理团队方面变得熟练。)

4. **被动语态**

   - The painting was skilfully done by an artist who is skilful in oil painting techniques. (这幅画是被一位擅长油画技法的艺术家巧妙地完成的。)

   - The project will be skilfully handled by our experienced team. (这个项目将由我们经验丰富且擅长处理的团队来妥善处理。)

**同义词辨析**

1. **Expert at**: 这个短语和 "be skilful in" 类似，表示在某方面是专家或高手。例如：She is expert at solving complex mathematical problems. (她在解决复杂数学问题方面是专家。)

2. **Proficient in**: 这个短语强调的是在某项技能或知识上有高水平的熟练程度。例如：He is proficient in several languages, including French and German. (他精通几种语言，包括法语和德语。)

3. **Adept at**: 这个短语意味着某人对某事有天生的才能或通过训练达到了熟练的程度。例如：She is adept at handling difficult situations with grace. (她擅长以优雅的方式处理困难的情况。)

4. **Good at**: 这是最常见的表达方式，表示在某方面做得好。例如：He's good at playing football and often scores goals for his team. (他擅长踢足球，经常为他的队伍进球。)

总结来说，“be skilful in”是一个强调个人在特定领域或技能上具备高水平能力和熟练度的表达。它与其他同义短语如 "expert at", "proficient in", 和 "adept at" 在语境中可以互换使用，但具体选择哪一个取决于要强调的程度和正式程度。而 "good at" 则较为口语化，适合日常对话中使用。