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主语从句，即在复合句中充当主语成分的句子，引导主语从句的连词主要有：从属代词：that, whether；连接代词：who, whoever, whom, whose, what, whatever, which, whichever, 连接副词：when, where, how, why。

Eg: What has caught our attention is /It is noticeable that the environment in both the rural and urban areas is deteriorating.

值得注意的是农村和城市的生态环境都在不断恶化。

Eg: It is universally acknowledged that environmental pollution becomes one of the most serious problems in China or even the world as a whole.

众所周知，环境污染问题是中国乃至世界面临的最为严重的问题之一。

延伸阅读：

托福口语中常用的词汇和短语

托福口语常用句型整理

托福口语话题实例解题分析（二）

更多阅读资料：
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