含有否定意义的副词或连词如hardly,never,not,not only,little等被前置时用部分倒装。例如：Never shall I forget it.
词组hardlywhen和no soonerthan都表示“刚刚…就”的意思。为了强调，这类句子也常常用倒装语序。例如：I had no sooner got there than it started raining heavily.变成：No sooner had I got there than it started raining heavily.
如果还是不明白的话我建议你去买本语法书来看，里面说的会更全面些…
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