並列結構作主語時謂語用複數

reading and writing are very important.

 注意: 當主語由and連結時,如果它表示一個單一的概念,即指同一人或同一物時,謂語動詞用單數,and 此時連線的兩個詞前只有一個冠詞。
 the iron and steel industry is very important to our life.

典型例題
 the league secretary and monitor ___ asked to make a speech at the meeting.
a. isb. was  c. are  d. were
答案b. 註: 先從時態上考慮。這是過去發生的事情套用過去時,先排除a.,c.。本題易誤選d,因為the league secretary and monitor 好象是兩個人,但仔細辨別, monitor 前沒有the,在英語中,當一人兼數職時只在第一個職務前加定冠詞。後面的職務用and 相連。這樣本題主語為一個人,所以應選b。