|
【考点5】what与that引导名词性从句的区别 It is not always easy for the public to see ______ use a new invention can be of to human life. (2011·重庆卷) A. whose B. what C. which D. that B 空白处作动词 see 的宾语。宾语从句按顺序为：a new invention can be of what use to human life，疑问词what置前。引导词what在句中既作了引导词，又在句中有实义。 Modern science has given clear evidence ______ smoking can lead to many diseases. (2011·天津卷) A. what B. which C. that D. where C that引导词作前名词evidence的同位语从句引导词。该词只起引导作用，无实义，不可省略。 1. 在名词性从句中，that只起连接主句和从句的作用，在从句中不充当任何成分，本身也没有词义，即从句中不缺少任何成分时用连词that。 2. that在从句中作主语时通常用it作形式主语，而将that从句置于句末作真正的主语。但what不能用it作形式主语。 3. that可引导同位语从句，但what不能。 【考点6】由reason作主语时，表语从句的连接词 The reason why he can't go to school is ______ he is ill. A. because | 
