句子的变化
陈述句的否定
种类
谓语动词含有be 动词或情态动词
这时直接在be 动词或情态动词后加否定词not 即构成否定句
He is a teacher.
He is not a teacher.
谓语动词是实义动词
这时陈述句的否定要借助于助动词do + not 来构成，
若主语是单数第三人称则用does + not + 动词原形
I like English.
I do not like English.
一般疑问句
种类
谓语动词含有be 动词或情态动词
这时要构成一般疑问句，只需将be 动词或情态动词移到句首。
He is a teacher.
Is he a teacher?
Yes, he is./No, he isn’t. //肯定回答用yes，否定回答用no.
谓语动词是实义动词
这时要借助于助动词do 或does,将do 或does 放在句首。
特殊疑问句
特殊疑问句是在上述一般疑问句的基础上变化而来的，句式：特殊疑问词+一般疑问句或主语的疑问词+谓语部分。
常用疑问词
who // Who can sing in English?
what // What are you doing？
when // When were you born?
where // Where does he live?
how // How does he go to school?
why // Why do you often study at the library?
which // Which pen do you want?
whose // Whose book is this?
how 的用法详解
单独使用，是对动作的方式进行提问。
How do you go to work?
和其他形容词或副词连用
How old are you?
How tall is he?
How big is your new house?
How far is it from your hone to school?
How well does he speak English?
How quickly can you get here?
How often do you write to your parents?
How many times a month do you write to your parents?