azz a. b. Does (a) necessarily mean that I know who will leave?
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azza. Certain people will leave.b. Some people will leave.Does (a) necessarily mean that I know who will leave?That's what is implied.
azzc. I don't know if some of them will be there.d. I don't know if certain of them will be there.Does (c) could be used if as far as I know none of them will be there?That is a possibility