标题: 语法笔记246题的两点疑问 [打印本页] 作者: gamxiaoyuan 时间: 2011-7-13 19:28 标题: 语法笔记246题的两点疑问 Scientists have identified an asteroid, 2000 BF19, that is about half a mile wide and, if it strikes Earth, it can do tremendous damage to part of the planet but probably not cause planetwide destruction. A. and, if it strikes Earth, it can do tremendous damage to part of the planet but B. and, if it would strike Earth, part of the planet could experience a tremendous amount of damage but it would C. and that, if it were to strike Earth, could do tremendous damage to part of the planet but would D. and that, if Earth is struck by it, can do part of the planet tremendous damage, but it would E. and that, if it strikes Earth, it could experience a tremendous amount of damage but 这题的正确答案是C，但是我有两个问题想问： 1.语法笔记上说B的if条件句里的虚拟语气谓语形式错误，表示可能与将来事件相反,这句话是什么意思？为什么划线末端的it would...不存在这个问题？ 2.and that...是和前面的that is about half a mile wide对应修饰asteroid的么？如果是的话and that后面加逗号再加条件状语从句可以这样修饰么？ 作者: jameshzd 时间: 2011-7-13 21:00
1：若虚拟语气表示与将来事件相反的话，从句 即if 句 后面的谓语形式是 were to do， 而主句是 would do，解释了后面为什么用 would。而前面要用were to do，用would 就错了。
2：是都是修饰asteroid， 你可以把 if 从句理解为插入语，来限定条件的。去掉 if 不看就是：an asteroid that is ...and that could... 其中 is 和 could 平行。 hope it helps~作者: gamxiaoyuan 时间: 2011-7-13 21:08
解释的太好了，跪谢！！！作者: nemiah 时间: 2011-7-13 21:10
could也是可以用在虚拟语气的哦？作者: jameshzd 时间: 2011-7-13 21:10
~加油！！！感谢你今天给我发的逻辑英文帖子呢，帮我解决了大问题。