To clarify a bit, mastery of the language should not be confused with the ability to communicate. There are plenty of native English speaking people do poorly t

To clarify a bit, mastery of the language should not be confused with the ability to communicate. There are plenty of native English speaking people do poorly to communicate. Last year I worked on a project with a developer from Mexico. While his English was good enough, his communication abilities overall were above average. One of his key strengths was to ask for clarification if I said something he didn't understand. That helped both of us. It made me have more empathy in my comms, and it expanded his understanding. So I would suggest asking for clarification if you're not clear, before you reply. Yes, some people will be a*holes about it. But most will appreciate your humility and transparency. Funny story. My Mexican colleague and I were having a conversation. I said "yada yada yada" from Sienfeld and he asked "what is this yada yada yada?" An enlightening moment for both of us. We still joke about it.