1. have difficulty (in) doing sth
结构：主语 + have difficulty (in) + 动名词
例句：I have difficulty understanding spoken English.
（我在理解英语口语上有困难）
2. find it difficult/hard to do sth
结构：主语 + find it + 形容词 + to do
例句：She finds it hard to focus when studying.
（她发现学习时很难集中注意力）
3. struggle with sth（更强调努力克服）
结构：主语 + struggle with + 名词/动名词
例句：Many students struggle with writing academic essays.
（许多学生写学术论文很吃力）
4. It is challenging/difficult for * to do sth
结构：It is + 形容词 + for * + to do
例句：It's challenging for beginners to master grammar rules.
（对初学者来说掌握语法规则很有挑战性）
5. have trouble (with) doing sth
结构：主语 + have trouble (with) + 名词/动名词
例句：They had trouble communicating in English.
（他们用英语交流有困难）
常见错误提醒：
✘ I have difficulty to read → ✔️ I have difficulty reading（动名词错误）
✘ It's difficult for me understanding → ✔️ It's difficult for me to understand（不定式错误）
扩展表达：
Be a struggle: Learning Chinese is a real struggle for me.
Feel overwhelmed by: He feels overwhelmed by the workload.
根据具体语境选择最合适的表达方式即可，建议多结合例句体会细微差别。
