Practice the art of distilled communication.
Q: "Your motor can run or not?"
A: "No. Not correctly."
When you get a yes or no question from a differnt language, the
best answer is yes or no.
Adding a narrative is great with Primary Language English speakers,
where you are expected to justify your answer with supporting
arguments, but with English as a second language the justification
can impede communication.
I am not saying that they can't read your answer, I am saying the
longer answer is more work and distracts the reader/translator from
acting on your answer in order to translate.
Just my opinion, but I have had a great experience dealing with Yao.