If you want to find out if the others in the group have understood or if they agree with you, you can say:

　　Do you see what I mean

　　Don't you agree, Simon?

　　Don't you think so, Mrs Robinson?

　　Are you with me?

　　Are we unanimous3?

　　Does anyone object?

　　If you don’t understand what someone has said, you can say:

　　Sorry, could you say that again, please?

　　Sorry, I didn't quite understand.

　　I'm sorry, I didn't catch what you said.

　　Sorry, I'm not quite with you.

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