在英语学习中，掌握句子结构的转换技巧是非常重要的。其中，将陈述句变为否定句和一般疑问句是基础中的基础。通过简单的口诀和练习，我们可以轻松地完成这种转换。接下来，让我们一起探索这一技巧。

一、陈述句变否定句的口诀

1. 有be动词（am/is/are）：直接加not

- 口诀：“be加not，否定句成。”

- 示例：She is a student. → She is not a student.

2. 有助动词（do/does/did）：助动词加not

- 口诀：“do/does/did加not，否定句现。”

- 示例：I do like apples. → I do not like apples.

- 示例：She does like oranges. → She does not like oranges.

3. 无助动词且主语为第三人称单数：加does not

- 口诀：“第三人称单数句，does not来帮忙。”

- 示例：He likes bananas. → He does not like bananas.

4. 无助动词且主语非第三人称单数：加do not

- 口诀：“非三人单数句，do not用得妙。”

- 示例：They play football. → They do not play football.

二、陈述句变一般疑问句的口诀

1. 有be动词（am/is/are）：提前be动词

- 口诀：“be提前，问号跟上。”

- 示例：She is a student. → Is she a student?

2. 有助动词（do/does/did）：提前助动词

- 口诀：“助动词前移，疑问句现形。”

- 示例：I do like apples. → Do you like apples?

- 示例：She does like oranges. → Does she like oranges?

3. 无助动词且主语为第三人称单数：加does

- 口诀：“第三人称单数句，does来助问。”

- 示例：He likes bananas. → Does he like bananas?

4. 无助动词且主语非第三人称单数：加do

- 口诀：“非三人单数句，do来问。”

- 示例：They play football. → Do they play football?

三、练习题

1. 将以下句子改为否定句：

- She has a book. → _________________

- We eat lunch at noon. → _________________

2. 将以下句子改为一般疑问句并回答：

- He plays basketball every day. → _________________

- Answer: ___________________

3. 将以下句子改为否定句和一般疑问句：

- They watch TV in the evening. → Negation: _________________

- Question: _________________

四、答案解析

1. 否定句：

- She does not have a book.

- We do not eat lunch at noon.

2. 一般疑问句及回答：

- Does he play basketball every day?

- Yes, he does. / No, he doesn't.

3. 否定句和一般疑问句：

- Negation: They do not watch TV in the evening.

- Question: Do they watch TV in the evening?

通过以上口诀和练习，相信你已经掌握了陈述句变否定句和一般疑问句的方法。多多练习，灵活运用，你会发现英语学习变得更加简单有趣！