1. Basic expressions (基础表达)
have a problem with something
have difficulty (in) doing something
have trouble doing something
例句：
I'm having difficulty understanding this math problem.
Do you have trouble falling asleep at night?
2. More formal alternatives (正式场合)
encounter difficulties in doing something
experience challenges when doing something
face obstacles in doing something
例句：
Researchers encountered difficulties in reproducing the experiment results.
Many students face obstacles when adapting to online learning.
3. Idiomatic expressions (地道说法)
can't seem to do something (委婉表达困难)
struggle with something
run into problems doing something
例句：
I can't seem to get this software to work properly.
She's been struggling with the pronunciation of German words.
4. Advanced variations (高阶表达)
find it challenging to do something
have a hard time doing something
be up against something (遇到棘手问题)
例句：
Non-native speakers often find it challenging to master English articles.
We're up against some technical difficulties with the new system.
常见错误提醒：
× I have difficulty to speak English.
✓ I have difficulty (in) speaking English.
× She has problem with driving.
✓ She has a problem with driving.
这些表达可根据具体语境灵活使用，口语中多用简单形式（have trouble/have difficulty），书面语中可用更正式的表达（encounter difficulties/experience challenges）。注意所有结构后接动词时都要用-ing形式。
