【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
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