Where to go.how to work .what to do.when to leave.这是不定式特有的一种形式,通常当主语.
这里的facing是现在分词做questions的定语 .
questions facing many people today=questions that face many people today在这个定语从句中questions是先行词.在从句中充当主语.
questions many people facing today,是错的.正确的写法是questions many people face today.
questions是先行词.在从句中充当宾语.
注意；先行词都是questions.但,一个是充当主语,一个充当宾语.