题目内容：

Only after her mother came to help her was she allowed to begin her project.
正常语序是：She was allowed to begin her project after her mother camte to help her .用Only开头的句子与另外一个表达有什么区别,（用Only的比较正式化?外国人常用那种呢?

优质解答

Only在这里是倒装句.当句首状语由“only +副词”,“only +介词词组”,“only +状语从句”构成时,句子须倒装.例如：Only yesterday did he find out that his watch was missing.Only because there were some cancel...