第五讲名词性从句

从属连词that, whether与if引导的名词性从句 　　

　　[全析考法]

　　单句语法填空/单句改错

　　1．(2018·11月浙江高考)It is possible ________ caffeine may cause birth defects (缺陷) in humans, too.

　　解析：that　分析句子结构可知，该句是一个主从复合句，it作形式主语，that从句为真正的主语。

　　2．(2017·天津高考改编)She asked me________ I had returned the books to the library, and I admitted that I hadn't.

　　解析：whether/if　句意：她问我是否已经把书还给图书馆了，我承认说我还没有还。分析句子结构可知，空格处引导宾语从句，且在从句中不作任何成分，只起连接作用；又根据句意可知此处表示"是否"，故用whether或if引导宾语从句。

　　3．(2016·北京高考改编)The most pleasant thing of the rainy season is________ one can be entirely free from dust.

　　解析：that　句意：雨季最令人高兴的事情就是人们可以完全远离灰尘。分析句子结构可知，本句包含一个表语从句，且表语从句中句子结构完整，故使用that引导表语从句，that在表语从句中不作句子成分，只起连接作用。

　　4．(2016·天津高考改编)The manager put forward a suggestion ________ we should have an assistant. There is too much work to do.

　　解析：that　句意：经理提出了一个建议，我们应该有一个助手。工作太多了。分析句子结构可知，空处引导同位语从句，解释说明suggestion的具体内容，故填that。

　　5．(2016·江苏高考改编)It is often the case________ anything is possible for those who hang on to hope.

　　解析：that　句意：通常情况下，对于那些坚持希望的人来说，一切皆有可能。空处引导主语从句，从句中不缺少任何成分且意思完整，故使用that引导。

　　6．(2015·全国卷Ⅱ)After looking at the toy for some time, he turned around and found where his parents were missing.________________

解析：where→that或去掉where　found后是一个宾语从句，不缺少句子成分且句