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am/is/are
2. 主谓宾
do/does
1.主系表
am/is/are
Eg: (1) I am a teacher.
(2) You are a student.
(3) She is beautiful.
2.主谓宾
do/does
Eg: (1) I cry.
(2) You smile.
(3) She likes meat.
三、标志
常与表示现在频度的时间状语连用
1.always>usually>often>sometimes>hardly>seldom>never
2.everyday/week /month/year
3.once, twice, three times a day/week/month/year
四、用法（2+2）
1.规则用法：
（1）现在经常性，习惯性的状态
am/is/are
Eg: (1)I am a teacher.
(2) You are a student.
(3) She is beautiful.
（2）现在经常性，习惯性的动作
do/does
Eg: (1) I cry.
(2) You smile.
(3) She likes meat.