The new employee soon proved that he was capable and that he could be trusted.
=(a) The new employee soon proved NOT ONLY that he was capable, BUT ALSO that he could be trusted.
=(b) The new employee soon proved that NOT ONLY was he capable, BUT ALSO that he could be trusted.
为什么(a)句不需要倒装,而(b)句必须倒装呢?
这很简单,not only前置于主语前才导致部分倒装。如果not only位于that之前,则not only就不属于that从句的结构,所以that从句不倒装。如果not only位于that之后,则是that从句结构的一部分,前置于从句主语之前,必然导致that从句部分倒装。
至于not only位于that从句中,和后面的but also不对称,违反了平行原则,那是另当别论的,这里就不讨论了。
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