擅长:语法理论,语言学,文化背景
我们分析这个句子:
This is the first time that I have visited Beijing. 这是我第一次参观北京。
This is the first time 为主句,that I have visited Beijing. 为定语从句,修饰 the time,that 为关系副词,可以省略所以,我们还常说:This is the first time I have visited Beijing. 要么用that 引导,要么省略,一般不用 when。
其他变式:This (It, That) is the first (second, third) time that ...
理由:由于this 是指示代词作主语,排除形式主语it,排除that I have visited Beijing 是真正主语;同时,排除强调结构。