识文断句(3)

　识文断句 1. [原句] Only after her mother came to help her for the first few months was she allowed to begin her project. (P2) 在她母亲头几个月来帮忙后，她才得以开始自己的计划。

　[点拨] 此句是一个主从复合句结构。主句为 was she allowed to begin her project；从句为时间状语从句：Only after her mother came to help her for the first few months。

　 以 only + 状语（一般为介词短语、副词、从句等）开头的句子要实行部分倒装，即：把谓语的一部分（如情态动词、助动词等）放到主语前。如：

　Only with effort can we finish the project.

　只有通过努力，我们才能完成这项工程。

　Only then could the work be seriously begun.

　只有那时这项工作才能真正开始。

　Only when I reached the top of the mountain did I feel a great sense of achievement. 只有当我到达山顶的时候，我才有一种巨大的成就感。

　（when 引导的从句不倒装，只有主句倒装。）

　Only after he left school did he begin to do chimp research.

　直到他离开学校后，他才开始对黑猩猩实行研究。（after 引导的从句不倒装，只有主句倒装。）

　[小试] 根据汉语提示完成下列句子。

　1. Only then ______ ______ ______ (她才认识到) that there was a connection between smoking and lung cancer. 2. Only after I referred to the telephone directory ______ ______ ______ (我才知道) his telephone number. 3. Only in this way ______ ______ ______ ______ ______ (我们才可以解决这个问题). 2. [原句] Once I stop, it all comes crowding in and I remember the chimps in laboratories. (P2) 我一旦停下来，所有的一切都会涌上心头，我就会想起实验室里的黑猩猩。

　[点拨] 此句是一个主从复合句结构。主句是由 and 连接的两个并列分句；从句是 once 引导的时间状语从句，即：Once I stop。在主句中 crowding in 是动词-ing短语作状语修饰 comes。once 用作连词时，意为“一旦……就……”，用于连接时间状语从句。如：

　Once water begins to boil, its temperature no longer rises.

　水一开始沸腾，温度就不再升高。

　Once it is seen, it can never be forgotten.

　见一次就永远不会忘记。

　Physics is easy to learn once you understand the rules. 一旦你理解了规则，物理就不难学了。

　[仿写] 1. 一旦你开始读，你就会喜欢它。

　. 2. 一旦你开始了，就不要放弃。

　. 3. 一旦染上坏习惯，想改掉就难了。

　 Key: 1. Once you begin to read it, you will like it.

　2. Once you start, never give it up. 3. Once you get into a bad habit, it is hard to get out of it.

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