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选修8 Unit 1（2） That is why today over 40% of Californians speak Spanish as a first or second language. 这就是今天有超过40%的加利福尼亚人把西班牙语作为第一或第二语言的原因。 (1)This/That is why...为表语从句的常用句型结构，意为“这/那就是为什么……”，用来表示原因。 (2)That’s because...这是因为……，because从句表示原因 (3)The reason why...is/was that...……的原因是……，表语从句常用that引导，而不用because。 ①Tom came late for the meeting.That_was_because he was ill. 汤姆开会迟到了，那是他病了。 ②Tom was ill.That_was_why he came late for the meeting. 汤姆病了，那就是他开会迟到的原因。 ③The reason why Tom came late for the meeting was that he was ill.汤姆开会迟到的原因是他病了。However，it is likely that Native Americans were living in California at least fifteen thousand years ago. 然而，可能美洲土著人至少一万五千年前就生活在加利福尼亚。 本句式中it为形式主语，真正的主语为that从句。 It is likely that...……是可能的，此句型可转化为：sb./sth.be likely to do...某人/物可能干某事。 ①It is very likely that，in many schools，the students are going to spend less time in doing homework than they used to. | 
