怎样区分that 做指示代词还是引导定语从句Genetic engineering introduces into food genes that are not present naturally,can not be introduced through conventional breeding and may have unknown health effects that should be investigated

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怎样区分that 做指示代词还是引导定语从句Genetic engineering introduces into food genes that are not present naturally,can not be introduced through conventional breeding and may have unknown health effects that should be investigated

怎样区分that 做指示代词还是引导定语从句Genetic engineering introduces into food genes that are not present naturally,can not be introduced through conventional breeding and may have unknown health effects that should be investigated
怎样区分that 做指示代词还是引导定语从句
Genetic engineering introduces into food genes that are not present naturally,can not be introduced through conventional breeding and may have unknown health effects that should be investigated before the food is sold to the public.句子里面的最后一个that参考书中说是指示代词,指代food genes,不明白为什么不是做effects的定语,怎样区分呢

怎样区分that 做指示代词还是引导定语从句Genetic engineering introduces into food genes that are not present naturally,can not be introduced through conventional breeding and may have unknown health effects that should be investigated
问题:不明白为什么不是做effects的定语,怎样区分呢
Answer:
(1)从语法上讲可以把"effects"作为后一个"that"从句所修饰的先行词,但从语意上却行不通"需要被研究(调查)的健康效果".什么话?效果/影响是产生的,不是被研究/调查出来的.显然构不成逻辑上的修饰关系.
(2)全句的句构很清晰:主句+定从(1)和定从(2)
定从(1)中的谓语由三个并列谓语构成,它们的共同主语都是由关系词that来充当
定从(2)句构简单,只不过句中多了一个由before 引导的时间状语从句作其状语
注:定语从句的语法功能就是做修饰成分,当一个先行词由多个定语从句来修饰,或在间隔式定语从句中,定语从句修饰谁,要从句意和语法两个方面来考虑.在符合语法规则却又能与多个先行词构成逻辑上的修饰关系的定句从句是不存在的.即使存在也是歧义句是病句.
If you still feel confused ,leave a message please

.两个that都在句中充当定语从句的引导词
是不是定语从句根据主句成分是否残缺判断
而这个引导词指代的就是它前面的那个名词
也就是说that作为指示代词和定语并不矛盾

怎样区分that 做指示代词还是引导定语从句Genetic engineering introduces into food genes that are not present naturally,can not be introduced through conventional breeding and may have unknown health effects that should be investigated 关系代词that引导定语从句,在从句中做表语,that 可以省略吗? 先行词是专有名词时,用哪个关系代词引导定语从句是用THAT 还是用WHICH引导? 当先行词是指人的关系代词在定语从句中做表语用that引导定语从句.请举例. 怎样区分what和that、which引导的定语从句如上 怎样能区分定语从句中关系代词是主语还是宾语 怎样能区分定语从句中关系代词是主语还是宾语,ji 名词性从句和定语从句都有that做引导词,如何区分两种句型名词性从句和定语从句都有that做引导词,但是that在其中的意义不同,那么看到一个从句,里面含有that,如何判定是名词性从句还是定语 怎样看定语从句中的关系代词或关系副词 是做 主语 定语还是宾语? that引导的宾语从句和定语从句怎么区分that引导的从句是宾语从句还是定语从句?that如果引导的是定从，是不是that后面只能加谓宾？还是主谓宾都有 怎么区分指示代词和代词 指示代词是什么指示代词在句中常做主语,宾语,表语和定语这些都是什么 定语从句中的引导词that和which如何区分 请问在英语定语从句中如何快速判断出引导词该用where还是that?,也就是怎样判断先行词做宾语还是地点状语? 在定语从句中,怎样区分when和that引导时间状语时,甚么时候用 when 怎样区分when和which引导的定语从句 在英语中,用that引导的句子怎样辨认它是表语从句还是定语从句 those做定语从句的先行词,用什么关系代词?which还是that?为什么?