The simple rule about questioning is that the question that should be asked should not evoke a yes or no answer.
What you want is for the person to whom you are directing the question has to answer in full. So you don’t want to start a question with could you, will you, do you think.
There are only certain starting words that will be relevant to asking truly open questions and they are, who, which, what, how, when, where.
You can start a question with why which would be open but remember that it can be a little by judgemental.
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