answer:It is a bit awkward to have the start of your sentence be parenthetical, partly for the reason you describe. Usually a sentence should stand alone without the part in parentheses, so you capitalize the un-parenthetical part as if the parenthetical part did not exist, and then you capitalize the parenthetical part as if you were adding it to the parenthetical part, but in this case, if you do that, you end up with an odd capital in the un-parenthetical part, which I think is most correct if you do write that, but if you were concerned with best formal writing practices, I would recommend not writing it that way. If you do write the words you used, I would put the parentheses like this: “You (have the feeling that you) are being followed. What do you do?” and I would leave out the ”(men and women)” part, since that includes everyone, and since you explain in detail in the following description. Assuming you did need the ”(men and women)” part, I might write: “You (have the feeling that you) are being followed. What do you (men and women) do?” Having ”(men and women)” where you did in the sentence, I would call a fragment (i.e. not strictly correct). I might also avoid parentheses entirely by writing something like: “You think you are being followed. What do you do?” (Those ( ) are parentheses. These: [ ] are brackets.)