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Since our chief business with them is to enable them to share in a common life we cannot help considering whether or not we are forming the powers which will secure this ability.(2009年翻译49题)

首先，我们还是需要断句。在这里我们把它断成两部分①Since our chief business with them is to enable them to share in a common life ②we cannot help considering whether or not we are forming the powers which will secure this ability 。在这里断句可能存在一些难度，就是因为在这里其实省略了一个逗号：Since our chief business with them is to enable them to share in a common life , we cannot help considering whether or not we are forming the powers which will secure this ability. 我们需要给它补充完整。

然后我们可以开始抓主干，识修饰了，要想快速的抓到主干，我们先把从句识别出来。首先第 一个从句：Since our chief business with them is to enable them to share in a common life。这里是一个原因状语从句。第二个从句：whether or not we are forming the powers which will secure this ability。这是一个宾语从句。第三个从句：which will secure this ability，这里是一个定语从句修饰power。抓出从句之后，我们就找到了句子的主干其实we cannot help considering。

最后我们可以开始理解整个句子翻译了：由于对于年轻人，我们的首要任务是使他们能够在生活中彼此分享，这样我们就禁不住会思考我们是否在形成能确保这种能力的力量。