1、并列结构做主语时用复数,如reading and writing are very important. 但是要注意,当主语由and连接时,如果它表示一个单一的概念,谓语动词要用单数

3、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等组成的短语时,谓语动词与前面的主语部分一致

5、代词what, which, who, none, some, any, more, most, all等词的单复其指代的词的单复数决定,集体名词作主语时,谓语的单复数要根据主语的意思来决定
