七、方式副词well或频度副词often, many a time always, once, every two hours,以及then开头的句子，要部分倒装 Often did I remind him not to do that. Many a time has he made the same mistake.

八、用于句首状语的否定句。这类否定词有； Not , never, hardly, barely(几乎不), scarcely(几乎不), little, never before(以前从不), by no means(决不),

under no circumstance(决不), in no time(很快), in no case(决不), nowhere(没有地方), at no time在任何时候决不