关于only倒装部分的话不严密。 only放句首,若含有主从句,只有主句倒装,用部分倒装,从句不倒装。 如:Only when he told me the news did I know what had happened.中从句when he told me the news不用倒(因为when肯定引导的是从句),剩下的为主句,才使用部分倒装。 第二句话的解释中提及的状语从句就是这个意思。
only+ 副词状语,介词短语做状语,状语从句,只要放在句子前面,主干都倒装。 如Only then did he realize he was wrong. Only in the morning can you meet him in the office. Only when you fail will you feel regretful.