一般现在时
1、何时用?+句型结构
A:经常的状态
主语+be动词(is/am/are)+n./adj./adv./prep.(非动词)
I am a teacher.
He is busy.
I am here.
She is at home.
B:习惯的动作
主语+动词(vi./vt.)
主语(非单三)+动词原形
I like coffe.
主语(是单数第三人称)+动词加s/es
He likes beef.
My husband likes steak.
C:真理,客观事实
主语+be动词(is/am/are)+n./adj./adv./prep.
The earth is round.
主语+动词(vi./vt.)
The sun rises in the East.
2、变否定句
A:句中有be动词的,在be动词后加not
I am not a teacher.
He is not busy.
I am not there.
She is not at home.
The earth is not round.
B:主语+动词(vi./vt.)(三无句型)
主语(非单三),引外援don't放在动词前
I like coffee.
I don't like coffee.
主语(是单数第三人称),引外援doesn't放在动词前,动词变原形
He likes beef.
He doesn't like beef.
3、变一般疑问句
A:句中有be动词的,把be动词提前,放在主语前
Are you a teacher?
Is he busy?
Is she at home?
B:主语+动词(vi./vt.)(三无句型)
主语(非单三),引助动词do放在主语前
Do you like coffee?
Yes, I do.
No, I don't.
主语(是单三),引助动词does放在主语前
Does he like beef?
Yes, he does.
No, he doesn't.
4、变特殊疑问句
A:句中有Be动词
对主语提问
He is a teacher?
Who is a teacher?
对句子其他成分提问
He is a teacher.
结构:特殊疑问词+be动词+主语+...?
What job is he?
B:三无句型
对主语提问
对句子其他成分提问
结构:特殊疑问词+do/does+主语+...?
He sits under the tree.
Where dose he sit?
He likes coffee.
What dose he like?