1. speak up - 大声说出来，发表意见或建议

例句：Don't be afraid to speak up if you have any questions during the lecture.（如果你在讲座期间有任何问题，请毫不犹豫地提出来。）

2. speak out - 公开发表意见或批评

例句：The famous actress decided to speak out against the discrimination she faced in the industry.（这位著名女演员决定公开发表她在业界所遭受的歧视。）

3. speak one's mind - 直言不讳，坦率地说出自己的想法

例句：I appreciate it when people speak their mind instead of just agreeing with everything I say.（我喜欢那些直言不讳、不仅仅是赞同我所说的一切的人。）

4. speak of the devil - 说曹操，曹操就到

例句：Speak of the devil, I was just talking about you!（说曹操，曹操就到，我刚才还在谈论你呢！）

5. speak volumes - 说明问题很清楚，具有很大的意义

例句：The fact that he showed up to help us without being asked speaks volumes about his character.（他主动前来帮助我们而没有被要求，这说明了他的品格有多么高尚。）

6. speak for oneself - 只代表自己，不代表别人

例句：I can only speak for myself, but I think we should postpone the meeting until next week.（我只能代表我自己，但我认为我们应该把会议推迟到下周。）

7. speak in tongues - 说方言，说神语

例句：Some people believe that speaking in tongues is a sign of being possessed by the Holy Spirit.（有些人认为说方言是被圣灵附体的迹象。）

8. speak out of turn - 失言，说错话

例句：I'm sorry for speaking out of turn earlier, I didn't mean to offend anyone.（我之前失言了，对不起，我没有想要冒犯任何人。）

9. speak the same language - 意见一致，达成共识

例句：It's important that we all speak the same language when it comes to our company's goals and objectives.（当涉及到公司的目标和目的时，我们都达成共识是很重要的。）

10. speak in riddles - 说话含糊不清，讲话充满谜语

例句：I wish he would stop speaking in riddles and just tell us what he means.（我希望他停止说话含糊不清，直接告诉我们他的意思。）

11. speak one's piece - 表达自己的意见或观点

例句：I'll give you a chance to speak your piece before I make my final decision.（在我做出最终决定之前，我会给你一个表达自己意见的机会。）

12. speak for itself - 事实说明一切

例句：The quality of our products speaks for itself.（我们产品的质量说明一切。）

13. speak with a forked tongue - 说话不诚实，口是心非

例句：I don't trust him, I think he speaks with a forked tongue.（我不信任他，我认为他说话不诚实。）

14. speak to the devil - 想到谁就来了谁

例句：I was just speaking to the devil, and here you are!（我刚才在想到你，你就来了！）

15. speak your language - 用自己的方式表达自己的思想或感情

例句：Don't worry about using fancy words, just speak your language and I'll understand you.（不用担心使用花哨的词汇，只要用自己的方式表达自己的思想或感情，我就能理解你。）