英文中两个主语的话谓语和哪个保持一致?

英文中两个主语的话谓语和哪个保持一致?
希望能给出个比较详细完整的规则～
还有,下面和例句：
These things especial the bag is/are ...*应该用哪个?

1 并列结构作主语时谓语用复数,例如：
Reading and writing are very important.读写很重要.
注意：当主语由and连结时,如果它表示一个单一的概念,即指同一人或同一物时,谓语动词用单数,and 此时连接的两个词前只有一个冠词.例如：
The iron and steel industry is very important to our life.钢铁工业对我们的生活有重要意义.
主谓一致中的靠近原则
1）当there be 句型的主语是一系列事物时,谓语应与最邻近的主语保持一致.例如：
There is a pen,a knife and several books on the desk.桌上有一支笔、一把小刀和几本书.
There are twenty boy-students and twenty-three girl-students in the class.班上有二十个男孩,二十三个女孩.
2）当either… or… 与neither… nor,连接两个主语时,谓语动词与最邻近的主语保持一致.如果句子是由here,there引导,而主语又不止一个时,谓语通常也和最邻近的主语一致.例如：
Either you or she is to go.不是你去,就是她去.
Here is a pen,a few envelops and some paper for you.给你笔、信封和纸.
谓语动词与前面的主语一致
当主语有with,together with,like,except,but,no less than,as well as 等词组成的短语时,谓语动词与前面的主语部分一致.例如：
The teacher together with some students is visiting the factory.教师和一些学生在参观工厂.
He as well as I wants to go boating.他和我想去划船.
谓语需用单数
1）代词each以及由every,some,no,any等构成的复合代词作主语时,或主语中含有each,every时,谓语需用单数.例如：
Each of us has a tape-recorder.我们每人都有录音机.
There is something wrong with my watch.我的表坏了.
2）当主语是一本书或一条格言时,谓语动词常用单数.例如：
The Arabian Night is a book known to lovers of English.《天方夜谭》是英语爱好者熟悉的一本书.
3）表示金钱,时间,价格或度量衡的复合名词作主语时,通常把这些名词看作一个整体,谓语一般用单数.例如：
Three weeks was allowed for making the necessary preparations.用三个星期来做准备.
Ten yuan is enough.十元够了.
5 指代意义决定谓语的单复数
1）代词what,which,who,none,some,any,more,most,all等词的单复数由其指代的词的单复数决定.例如：
All is right.一切顺利.
All are present.人都到齐了.
2）集体名词作主语时,谓语的数要根据主语的意思来决定.如family,audience,crew,crowd,class,company,committee等词后,谓语动词用复数形式时强调这个集体中的各个成员,用单数时强调该集体的整体.例如：
His family isn't very large.他家成员不多.
有些名词,如variety,number,population,proportion,majority 等有时看作单数,有时看作复数.例如：
A number of +名词复数+复数动词.
The number of +名词复数+单数动词.
A number of books have lent out.
The majority of the students like English
与后接名词或代词保持一致
1）用half of,most of,none of,heaps of,lots of,plenty of 等引起主语时,谓语动词通常与of后面的名词/代词保持一致.例如：
Most of his money is spent on books.他大部分的钱化在书上了.
用a portion of,a series of,a pile of,a panel of 等引起主语时,谓语动词通常用单数.例如：
A series of accidents has been reported.媒体报道了一连串的事故.
如 many a 或 more than one 所修饰的短语作主语时,谓语动词多用单数形式.但由more than… of 作主语时,动词应与其后的名词或代词保持一致.例如：
Many a person has read the novel.许多人读过这本书.