英语陈述句变否定和一般疑问句

陈述句变成否定句 一） 在其句中含有动词的陈述句,在《BE》动词后加上〈not>即可：
例如：1) She was playing basketball at that time。
_ She was not playing basketball at that time。
2) We are having lunch at school 。
_ We are not having lunch at school 。
二） 在其句中含有情态动词的陈述句,在情态动词后加上〈not)即可：
例如：1） They can speak English very well。
_ Thet can not speak English very well 。
2) I can be a middle school student。
_ I can not be a middle school student 。
三） 在其句中含有实义动词的陈述句,在主语后实义动词前加上（don't ,doesn't ,didn't)即 可；其中（don't 和 doesn't)主要用于一般现在时态,（didn't)只要用于一般过去时态。在使用（doesn't 和 didn't)时,要将相应的谓语动词还原成原形；
例如 ：1） They love lishening to music 。
_ They don't love lishening to music 。
2) She gives me a book to read。
_ She doesn't give me a book to read。
3) My sister helped me learn French。
_ My sister didn't help me learn French 。
以上三点仅用于一般现在时态和一般过去时态的陈述句。
陈述句变一般疑问句
一般疑问句分为be词提前和助动词
1 be词（am\is\are和他们的过去式were\was）提前
eg：1）He is a student!(他是一名学生)
Is he a student?（他是一名学生吗?）
2) We are students!（我们是学生）
Are you students?（你们是学生吗?）
3)I am a student!(我是一名学生!)
Are you students?（你是学生吗?）
2助动词（do\did have\had ）
eg:1) He eat an apple。(他吃苹果。)---eat为动词原形用do提问
Do he eat an apple?(他是苹果了吗?)
2）He ate an apple。（他吃了苹果）--ate为eat的过去分
是词用did提问同时动词ate恢复原形为eat
Did he eat apple?(他吃了苹果了吗?)
3）I have\had finished homework。(我完成了作业)
Have\had you finished homework?(你完成作业了没?)
3 can \ may \must 等情态动词
eg:1)we can\may\must do it 。(我们能\可能\必须完成它)
Can\May\Must we must do it?(我们能\可能\必须完成它吗?)