Only then(状语)did I know the importance of learning.

　　Only when he lost health(状语) did he know its value.

　　Only 位于句首修饰主语不倒装

　　Only socialism(主语)can save China.

　　2. never, seldom, little, few, barely, hardly…when, scarcely, rarely, no longer, no more, no sooner…than等否定词语位于句首时需倒装。

　　Never have I heard or seen such a thing.

　　3. not构成的短语位于句首作状语或宾语时需倒装。常用此结构的短语有not a word, not a moment, not a bit, in vain(无用), not once or twice(许多次)，not only [merely]…but also, not by any means=not in any way [degree=not on any account =not on one’s life(决不), not in the least [slightest] 毫不，not until

　　Not a moment did she waste.

　　Not until yesterday did I learn anything about it.

　　4. no构成的固定短语在句首作状语需倒装。如by no means [rate, degree, possibility, way, accident]决不， at no [rate, time, point, period]决不，in no case [way, circumstances, form, respects, sense, condition, instances, sense, shape]决不， on no consideration [condition, occasion, account, terms]决不，under no occasion [account, consideration, circumstances, term (s)]决不，in no time立马

　　By no means shall we give up.

　　5. 在含有were, had, should的if虚拟条件句中，需省略if, 把were, had, should移至主语前。

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