1、标志：often（经常）,usually（通常）,sometimes（有时）,always（总是）,never（从不）,
on Sundays（在星期天）, every day/month/year（每一天/月/年）
2、结构：
（1）主语+连系动词be(am/is/are)+名词/形容词/数词/介词短语/副词等做表语表状态（包括There be +n.）
练习：1.I______(be) a student. My name_____(be) Tom.
2. Where _____(be) my shoes? They___(be) here.
3.Who ____(be) the girl with long straight hair? I think she ___(be) Kate.
4. You and I ___(not be) in Class Six.
5.___(be) there a supermarket on the Fifth Avenue? Yes, there_____(be).
6. ____ her parent tall? No, he____.
