It seems like your sentence was cut off. If you're trying to say that none of you expected the chairman to do something specific, you could finish the sentence like this:

"None of us expected the chairman to [verb] [object]."

For example:
- "None of us expected the chairman to show up."
- "None of us expected the chairman to speak at the event."
- "None of us expected the chairman to announce such drastic changes."

Could you please provide more context or complete the thought? I'd be happy to help you formulate the full sentence.