- that 引导定语从句时，如果在从句中充当宾语，that 可以省略
举例
• 我喜欢我妈妈给我买的这本书。
I enjoy the book (that) my mom bought for me.(不建议省略)
在分析长难句时候，如果见到有两个名词or代词直接放一起，中间没有被连词或者标点符号隔开，通常都是省略that定语从句
练习
• The potential evolution of today’s technology, and its social consequences, is dazzlingly complicated, and it’s perhaps best left to science-fiction writers and futurologists to explore the many possibilities we can envisage. - 区分限制性定语从句和非限制性定语从句
举例
• I love Liu, who is beautiful.
非限制性，有逗号
• I love Liu who is beautiful.
限制性，限制后面条件
分析长难句时候，非限制性定语从句相当于插入语，可以不看。
练习
• Edison, whose inventions have been over 2000, is a famous scientist.
爱迪生是著名科学家（有2000多项发明） - 先行词和引导词之间有介词的情况
人不用who用whom,物不用 that只能用whitch
举例
• He is the man from (whom) we should learn.
• I will never forget the day on (whitch) I met you. - 区别 the same … as；the same … that 引导的定语从句
举例
• He is the same man as I love.
像我爱的人
• He is the same man that I love.
是我爱的人 - as 和 which 引导的非限制性定语从句
which 引导的非限制性定语从句可修饰前面整个句子，as也可以,但是which只能放主句后面，as可前可后。
举例
• He enjoys talking with young ladies, which drives me mad.
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