主语是复数宾语一定是复数吗Most of them have an apple还是applesMost of them have a sweet tooth还是have sweet teeth

主语是复数宾语一定是复数吗Most of them have an apple还是applesMost of them have a sweet tooth还是have sweet teeth
主语是复数宾语一定是复数吗
Most of them have an apple还是apples
Most of them have a sweet tooth还是have sweet teeth

主语是复数宾语一定是复数吗Most of them have an apple还是applesMost of them have a sweet tooth还是have sweet teeth
先回答第一个问题：
主语的单复数与宾语的单复数没有必然的关系,主语的单复数只是与谓语动词的形式有关,而宾语的单复数要根据具体实际情况确定,例如：
All of us have a same hobby.我们都有一个共同的爱好
All of us have two hobbies.我们都有两个业余爱好.
针对你所说的问题：如果用an apple,则表示“他们当中的大多数人都有一个苹果（还有一小部分没有,或者有超过一个苹果）”如果选用apples,则表示“他们当中的大多数人都有几个苹果（还有一小部分没有或者只有一个）”根据具体情况进行选择
对于你的补充问题：
这里have a sweet tooth是一个固定搭配,表示“喜好甜食”
牙齿（tooth）是我们口腔中很重要的组成部分,没有tooth,很多美食我们都无法享用了.另外,在特别危急的时刻,tooth也可以成为我们自卫或者攻击的武器.这大概就是很多英文短语中tooth都用来代表力量的原因吧.一些常有的固定搭配如下：
1.set/put someone’s teeth on edge 使某人觉得紧张不安或不舒服
The on-the-spot punishment of the criminal put Harry’s teeth on edge.
现场处罚罪犯让哈里觉得很不安.
2.be armed to the teeth全副武装,装备齐全
Hitler was armed to the teeth when he launched the World War II,but in a few years,he was completely defeated.
希特勒在发动第二次世界大战时全副武装,可是没过几年,就被彻底打败了.
3.draw/ pull someone’s teeth off 使某人丧失能力,使某人变得无害
The explosion of the fort has pulled our enemies’ teeth off.
敌人碉堡的爆炸已经让他们丧失战斗力了.
4.take the bear by the tooth 虎口拔牙,铤而走险
We can pursue the strategy of market diversity rather than taking the bear by the tooth into the real estate industry.
我们可以走市场多元化道路,不用铤而走险,专攻房地产.
5.give teeth to 授予（个人或组织）特殊权力和制裁权
This month Singapore passed a bill that would give legal teeth to the moral obligation to support one's parents.
新加坡本月通过了一项法案,从法律上规定了人们供养父母的责任.
6.grind one’s teeth（因愤怒）咬牙切齿
The unfairness in our society always makes the cynics grind their teeth.
社会中存在的不公平现象总是让那些愤世嫉俗的人很不平.
7.show one’s teeth 做出威胁的样子,现出敌意,发怒
A man who harbors enmity in the bottom of his heart never shows their teeth.
一个在心底藏着敌意的人很少表现得有威胁性.
8.fight tooth and nail 拼命厮打,全力以赴地,不惜任何代价地
There is another election coming on next fall,and he knows we are going to fight tooth and nail.
明年秋天另一次大选就要来到了,他知道我们要为此全力以赴.
另外,单数tooth一般用于特指某颗具体的牙齿,而teeth一般泛指所有,例如：
The tooth is sensitive to cold.这颗牙对冷的东西很敏感.
The dentist drilled my tooth.牙医钻了我的牙.
Look,all my sharp teeth are gone.看,我所有锋利的牙齿都消失了.
Show me your teeth; open your mouth.让我看看你的牙；张开你的嘴.
希望我的回答对你有所帮助,

不一定 ， 你要表达什么意思 呢？

an apple
这里的意思是他们跌大多数都有一个苹果，侧重于每一个人。

apples

俺班英语老师说most of us后加复数 each of us后加单数
老师说的应该是对的吧