英语：有关某些职称前不加the的问题首先,请解释一下有关“主补”的知识,老师说职称名词在句中做表语,同位语,宾补是前不加the,还造了个句子：Tomwasmanagerofthedepartment.但我在字典上找到

Question

英语：有关某些职称前不加the的问题
首先,请解释一下有关“主补”的知识,
老师说职称名词在句中做表语,同位语,宾补是前不加the,还造了个句子：
Tom was manager of the department.
但我在字典上找到了个句子：
He was the chairman of the union.这里的“the”怎么解释?
问老师时他也没怎么认真讲,只好上网问了,

Answer 1

1. 主补即主语补足语,其用法目前尚存争议.
一般来说,中学只要掌握以下一点即可：主动句中的宾语补足语,其前面的宾语如果在变被动语态时做了句子的主语,则此时主动句的宾语补足语就变成了被动句的主语补足语了.
如：I saw him enter the room. 其中enter the room即宾语补足语.
变为被动句为：He was seen to enter the room. 其中的to enter the room即为主语补足语.
充当主语补足语的成分和宾语补足语一样,一般使用名词（短语）,形容词,少数副词,介宾短语,不定式和现在/过去分词（短语）.
再如：The dog is called Karl. 名词
The old man was found weak. 形容词
He was seen out just now. 副词
English is considered of great importance for us. 介宾
The spy was ordered to be hanged. 不定式
The classroom was found crowded with people. 过去分词
The professor was seen making an experiment in the chemistry lab. 现在分词
2. 语法规定如下：表示独一无二的职务/头衔的名词（短语）,如果单独充当表语/同位语/补足语时,前面一般不加the.
有两点需要向楼主说明：
1）必须是单独充当上述成分,如果该名词还有较长的起修饰限定作用的其他成分时,可以加the.
2）有时候,加the也是可以的,就看使用者会不会严格按照语法造句.
所以,我建议楼主不必纠结于这样的句子,知其大概即可.
楼主所给的两个句子无所谓谁对谁错,不过以不加the为更佳.