Period 5 Grammar--- Subject-verb agreement
Step 1. Lead in（give some examples）
1）I am/are seventeen. 2）She is/are sixteen. 3）There is/are a desk in the room.
Step 2. The definition of Subject-verb agreement
主谓一致是指句子的主语和谓语动词在人称和数上要保持一致。
Step 3. Explain the rules
一、名词作主语
1. 集体名词public, family, class, crowd, population, team, group, audience, majority, committee, enemy等作主语时，如果强调整体，谓语动词用单数形式，如果强调个体，谓语动词用复数形式。集体名词cattle, people, police等作主语时，谓语动词用复数形式。如：
My family is a small one.
My family were watching TV when the news came that we won the grand prize.
The cattle are eating grass in the field.
2. 单、复数同形的名词如species, deer, fish, sheep, Chinese, Japanese, means等作主语时，应根据其意义来决定谓语动词的单复数形式。如：
This species of rose is rare.
