og的解释是:The first and last verbs in the series of verbs that describe the calves are in the present tense, so the two in the middle should be as well:the Calves exercise...associate...require...gain weight.Adverbs,not adjectives, describe how an action is carried out.These calves gain weight more quickly,not quicker, than other calves.The comparison is between calves and those (referring to another set of calves);the verb do ungrammatically interrupts the comparison and should be eliminated.
但我想不通的是既然比较的是主语,为什么than后面没有加do,来表示those raised in confinement是和they(calves)这个主语作比呢?想不通啊,而且if后跟一般现在时,逗号后面应该是将来时才对啊。。。
请大家帮忙想想!
39 A study commitioned by the Department of Agriculture showed that if calves exercise and associate with other calves, they require less medication and gain weight more quickly than those raised in confinement.
如果than后边补出do,反而会有歧义,因为前面有两个动词require and gain, do只能代替一个动词,补出后改变句意
关于if
薄冰英语语法:条件句有真实条件句与非真实条件句两种。真实条件句所表的假设是可能发生的或现实的,...
1. Oil floats if you pour it on water. 现实的
2. If I have enough money next year, I will go to Japan. 可能发生的
我想本题所表达的意思如同例句1,是一个客观现实,不遵从“主将从现”;而且时态不是本题的考察重点,故我想不用深究
than后面不足动词主要是为了避免歧义。如:I know him better than you. 这句话可以理解成I know him better than you know him. or I know him better than I know you.
在这题中,即使不补足动词也不会引起歧义,故不一定要不足动词。
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