1.谓语是be(am/is/are)的一般现在时。
①肯定形式:主语+be+表语(形容词、名词充当表语)。
I am hungry.
You are beautiful.
He is a doctor.
②否定形式:主语+be+not+表语(形容词、名词充当表语)。
I am not hungry.
You aren't beautiful.
He isn't a doctor.
③一般疑问句形式:Be+主语+表语(形容词、名词充当表语)?
肯定回答:Yes,主语+be.否定回答:No,主语+be+not.
—Are you hungry?
—Yes,I am./No,I'm not.
—Is he a doctor?
—Yes,he is./No,he isn,t.
④特殊疑问句形式:特殊疑问词+Be开头的一般疑问句?
—What is he?
—He is a doctor.
注意:be要随着主语变。
2.谓语是情态动词can/may.....+动词原形的一般现在时。
①肯定形式:主语+情态动词can/may.....+动词原形+宾语。
I can finish my homework.
②否定形式:主语+情态动词can/may.....+not+动词原形+宾语。
I can't finish my homework.
③一般疑问句形式:情态动词Can/May.....+主语+动词原形+主语+宾语。
肯定回答是:Yes,主语+情态动词.否定回答是:No,主语+情态动词+not.
—Can you finish your homework?
—Yes,I can./No,I can't.
④特殊疑问句形式:特殊疑问词+情态动词can/may.....开头的一般疑问句?
—What can you do?
—I can do my homework.
注意:情态动词can/may.....+动词原形。
3.谓语动词是实义动词(及物动词或不及物动词)的一般现在时。
①肯定形式:“主语+及物动词+宾语”或“主语+不及物动词”。
She has a little brother.
她有一个弟弟。
The sun rises in the east.
太阳从东方升起。
②否定形式:“主语+don't/doesn't+及物动词+宾语”或“主语+don't/doesn't+不及物动词”。
She doesn't have a little brother.