1. Though raised in San Francisco, Dave Mitchell had always preferred to record the plain facts of small-town life. Although born in Chicago, the author is most famous for his stories about New York City. One should never lose one's heart when confronted with temporary difficulties.
这样省略的条件是：●从句中被省略的主语必须与主句的主语一致；●谓语动词必须含有 be；●从句必须与主语和 b e 动词一起省去，不可只省略主语而保留整个谓语，也不可只保留主语而省略谓语。
2. Likely also someone can say: Party of Deputy mayor Wang won't swim possibly, let a family enter the water go saving a person to be equal to let family lose one's life, this kind of exchange is not equal in value.
也可能有人会说：王副市长一行可能都不会游泳，让人家下水去救人等于让人家送命，这种交换不等价。