用于构成疑问句和否定句的词语及用法如下：

一、be动词（am/is/are）

一般疑问句：

将be动词提前至句首，be动词需根据主语变化形式（如am→are）

例：

I am a teacher. → Are you a teacher？

The cat is sleeping. → Is the cat sleeping？

否定句：

在be动词后加not

例：

The cat is sleeping. → The cat is not sleeping.

I am a teacher. → I am not a teacher.

二、助动词do/does/did

一般疑问句：

在实意动词前加do/does/did

例：

He eats breakfast every day. → Does he eat breakfast every day？

They played soccer last weekend. → Did they play soccer last weekend？

否定句：

在助动词后加not

例：

He eats breakfast every day. → He does not （doesn't） eat breakfast every day.

They played soccer last weekend. → They did not （didn't） play soccer last weekend.

三、特殊注意事项

含情态动词的否定句：

在情态动词后加not

例：

She can swim. → She cannot （can't） swim.

They should call you back. → They should not （shouldn't） call you back.

现在完成时态：

在have/has后加not

例：

I have finished my homework. → I have not （haven't） finished my homework.

They have visited Paris. → They have not （haven't） visited Paris.

四、其他常见用法

选择疑问句：用or连接两个选项

例：

Is Tom tall or short？ → He is tall.

反义疑问句：前肯后否或前否后肯

例：

You passed the exam, didn't you？ → Yes, I did.

特殊疑问句：以疑问词开头

例：

Where is the library？ → It's on the second floor.

通过以上规则，可以系统地构建疑问句和否定句。若需进一步了解具体语法结构，可参考英语语法书籍或权威资料。