3）Over thousand of years, man has taught his dogs to do many kinds of work besides guarding the home. （×）
thousand→thousands，复数形式。几千年以来…
4）For example, sheepdogs are famous for their ability controlling a flock of hundreds of sheep. （×）
Controlling→to control， 牧羊犬因为它们能控制上百只的绵羊群而出名，to control…解释具体的动作。
5）Dogs have been used to aiding disabled people for centuries. （×）
aiding→aid. Be used to do sth. 被用来做…
7）Nowadays, dogs can teacher to turn on light switches, （×）
teacher→be taught, can be taught, 能被教会…
10）however, dogs is simply pets and friends for both young and old members of the family. （×）
is→are, 主语是dogs，be动词用are
1. 具体数字+thousand、million、billion、dozen+名词时，这些词不加-s.
不是具体数字+ thousand、million、billion、dozen时，它们要加s，再加of+名词
2. used to do sth /过去常做某事，现在不做了
be used to do / 被用来做...
be used to doing sth/习惯于做某事

thousand, million, billion, dozen等数词的用法:1.表示具体的数字，及它们前面有具体的基数词时，它们只能用原形；如果表示概数,时,它们后面要加“s”,并且后面还有of;“八千”表达为“eight thousand”;“数百万的”表达为“millions of”used to过去常常, be used to do 被用来做;be used to doing习惯做

thousand,million,billion, dozen等数词用法，表示具体数这些词不加s用原形，如果表示概数不是具体数它们要加s再加of+n.八千eight thousand,数以万计tens of thousands;used to do过去常常做某事现在不做了，be used to do被用来做某事被动语态，be used to doing习惯做某事

3.thousand of years改成thousands of years，固定搭配；4.controlling改成to control，这里是ability的后置定语，表示控制。。。的能力，现在分词做定语表示修饰的名词发生的动作、属性和特征，显然这里control不是ability的动作、属性和特征；5.aiding改成aid，这里是“被用来做某事”，be used to do 被用来做某事，be used to doing 习惯于做某事；7.can teacher改成can be taught，dogs只能被训练；10.is改成are。求助一：thousands of years，two thousand years，以此类推，八千eight thousand，数百万millions of ，数以万计thousands of；求助二：used to过去常常做某事，I used to do yuga；be used to do被用来做，Scallion is used to cook；be used to doing习惯于做某事，I am used to doing some exercise。

thousand→thousands，复数形式。几千年以来…
Be used to do sth. 被用来做…

具体数字+thousand、million、billion、dozen+名词时，这些词不加-s.
不是具体数字+ thousand、million、billion、dozen时，它们要加s，再加of+名词
used to do sth /过去常做某事，现在不做了
be used to do / 被用来做...
be used to doing sth/习惯于做某事