探究发现
①Seldom has drumming caused such conflict.
②Had they known their neighbour was a drummer, they wouldn't have moved into the building.
③Neither could they relax nor read a book without plugging their ears.
④It was only after careful consideration that we gave Yang Ming a warning.
⑤No sooner had they moved in than the noise began and rare did they get a full night's sleep.
[我的发现]
(1)句①③⑤是否定词置于句首，引起的部分倒装。
(2)句②是省略“If”将“had”提前，还原②句为：If they had known ...
(3)句④是it用于强调结构中。
