2012考研必备：考研英语语法精要(33)
2.以only修饰状语开头的句子，句子的主谓要部分倒装only then, only at that time, only once, only in this way, only with, only through, only by, only when, only after, only because。如：
Only when you have obtained sufficient data can you come to a sound conclusion.
3.以下列副词或短语开头的句子，句子的主谓要部分倒装
often, so, well, to such a degree, to such an extent, to such extremes, to such a point，many a time。如：
So involved with their computers do the children become that leaders at summer computer camps often have to force them to break for sports and games.
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