我不会用英语怎么说

"I don't know how to say this in English." This sentence means that the speaker is not able to express something in the English language. It could be because they are not familiar with the vocabulary, grammar, or pronunciation of English. They may need help from someone who can speak English fluently or they may need to practice their English skills in order to better communicate.

If you want to learn more about how to improve your English, there are many resources available. You can take an English class at a local school or community center, use an online learning platform like Duolingo or Rosetta Stone, or watch English-language movies and TV shows with subtitles. It's important to practice speaking and writing in English as much as possible, even if it's just with yourself or a friend. With time and dedication, you can become more comfortable and confident using English.