在英语教学中，五大基本句型是学习者必须掌握的重要部分。以下是对每种句型的肯定句、否定句和疑问句形式的详细解读：
主语 + 系动词（be动词）+ 表语（S + V + C）
肯定句：
She is a teacher.
They were happy.
否定句：
She is not a teacher.
They were not happy.
疑问句：
Is she a teacher?
Were they happy?主语 + 动词 + 宾语（S + V + O）
肯定句：
He loves his dog.
They saw the movie.
否定句：
He does not love his dog.
They did not see the movie.
疑问句：
Does he love his dog?
Did they see the movie?主语 + 动词 + 间接宾语 + 直接宾语（S + V + IO + DO）
肯定句：
She gave him a book.
I sent her an email.
否定句：
She did not give him a book.
I did not send her an email.
疑问句：
Did she give him a book?
Did you send her an email?主语 + 动词 + 宾语 + 宾语补足语（S + V + O + OC）
肯定句：
They made her president.
He called the dog Max.
否定句：
They did not make her president.
He did not call the dog Max.
疑问句：
Did they make her president?
Did he call the dog Max?主语 + 动词 + 状语（S + V + A）
肯定句：
She dances beautifully.
They arrived yesterday.
否定句：
She does not dance beautifully.
They did not arrive yesterday.
疑问句：
Does she dance beautifully?
Did they arrive yesterday?
注意事项：
在形成否定句时，通常需要在动词前加助动词”do/does/did”（对于一般现在时和一般过去时）并添加”not”。
对于第一句型（S + V + C）由于使用的是be动词，否定句和疑问句形式直接在be动词上加”not”或倒装形成疑问句。
疑问句通常通过主谓倒装来形成，但如果句中有助动词或情态动词，则直接将这些词移到句首。