英语语法高手进

题目

英语语法高手进
我搞了几个句子 尤其是语法方面 我要用来写作文的
第一句：Believe it or not,look around yourself and you can,I bet,easily find that digital products have found their way into our daily life.As a result,never before has so much controversy been aroused concerning these high-tech products,ranging from computers to Mp4s.
第二句：Of the millions who saw Haley’s comet in 1986,how many people will live long enough to see it return in the twenty-first century.这句如果是对的话 主语应该是how many people吧
第三句：Long before children are able to speak or understand a language,they communicate through facial expressions and by making noises.这句是原句 只是我比较奇怪两个分句之间是否要加连词and,难道因为前面有Long before 就可以不加了么
暂时就这么多了

答案

第一句：句子正确.believe it or not,I bet 两词组都是插入语.后面一句 never 是否定含义的副词放句首,用了倒装.
第二句：how many people 是主语,本来是要说 how many people of the millions who saw Haley's comet in 1986 （在1986年看到过哈雷彗星的几百万人当中,有多少人.）
第三句：Long before “在.之前很久”,引导时间状语从句,后一句是主句,其中的 through facial expressions and by making noises 是两个并列的介词短语,“通过脸部表情和发出声音”.