Only by 和only through 的区别不是在于这两个词组，而是在于by 和through 的差别，因为only 放在句首后面的句子要到装，把by 或through 提到主语前面。所以只要 知道什么时候用by，什么. Only to 是表示很遗憾地发现。。。一般后面跟上不好的事情。 比如，i rush to the railway station, only to find the train has gone. Only if与only when的区别？only if 和 only when 都是英语中的连词，它们在含义和用法上有所不同。only if 的含义是“只有在某种情况下才会发生或实现某事”，它的语法结构通常是：only if + 条件子句 +.
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Sentence 2 is not impossible, but i agree with the newt:. 与the连用，意为“惟一的”，作定语。如： john is the only boy in his family. 'only' can appear in various positions, and often appears earlier than its 'logical' position (it's not next to what it actually talks about).
Only if：除非;只要…就;只有，只有当…；if only：只要;但愿 二者区别： 一、only if意为“only on the condition that, as long as”,“只要；假如”.它用于陈述事实或必要的条件,比if所表达的语气更强烈.
约翰是家里惟一的男孩。 she is the only girl here who knows how to drive a car. Only后面跟状语时，句子会进行倒装，以此来强调某种特定的方式或条件。这里所说的状语包括副词、介词短语以及状语从句。 例如，only in this way can you learn from your mistakes.. Be only与only be的区别 比如说：他只迷恋于赚钱是heisonlyobsessedwithmakingmoney还是heonlyisobsessedwithmakingmoney？ 顺便告诉我原因。.
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