If a question is dropped inside a statement or question, put a pair of dashes around it and a question mark after it.
...He was standing near -- were you aware of him at the time? -- the desk of the boss.
...I am going to read to you -- can you hear me? -- from your deposition of yesterday.
Do not cap after a dash unless the word ALWAYS has to be capped.
Grammar class starts tomorrow. It is not too late to join us.
Happy punctuating!
Margie