这些题目主要涵盖的是初中英语中的句型转换，包括一般疑问句、否定句、同义句、特殊疑问句以及选择疑问句等。以下是针对每个题目所涉及的语法知识点的详细解释：
1. 将陈述句变为一般疑问句时，通常需要将助动词或be动词移到句首，例如"I know the answer."变为"Do you know the answer?"。
2. 同样，"We can see some birds."变为一般疑问句是"Can you see any birds?"，注意some在疑问句中通常变为any。
3. "There is a computer in my house."的一般疑问句形式是"Is there a computer in your house?"，there be句型的一般疑问句结构保持不变。
4. "There are some flowers on the teachers'desk."的一般疑问句为"Are there any flowers on the teachers' desk?"，注意any用于否定或疑问句。
5. 否定句中，"There are"变"There are not"，缩写为"There aren't"，如"There aren't any apples on the tree."
6. "I think he is very old."的否定句是"I don't think he is very old."，think后的从句否定前移。
7. 请求对方不要做某事的否定句，如"Please don't colour it green."
8. "We can speak good English."的否定句是"We can't speak good English."，can后加not缩写为can't。
9. 同义句转换，"Thank you for helping me."可以换成"Thanks for your help."
10. "There aren't any pears in the box."的同义句是"There are no pears in the box."
11. "Whose are these clothes?"的同义句是"Who do these clothes belong to?"
12. "Let me look at your book."的同义句是"Let me have a glance at the content of your book."
13. "Her sweater is red."的特殊疑问句是"What color is her sweater?"，询问颜色。
14. "My pencils are in the pencil-box."的特殊疑问句是"Where are your pencils?"，询问地点。
15. "I get up at six every day."的特殊疑问句是"What time do you get up every day?"，询问具体时间。
16. "There are fifty students in my class."的特殊疑问句是"How many students are there in your class?"，询问数量。
17. "These are cars."改为选择疑问句是"Are these cars or buses?"，提供两种可能的答案供选择。
18. "The book is in my schoolbag."的否定疑问句是"Isn't the book in your schoolbag?"。
19. "Two boys are in our house."的there be句型是"There are two boys in our house."
20. "Can't you find the map?"的肯定回答是"Yes, I can."
单复数转换练习：
1. 单数名词变为复数时，遵循规则变化，如"The woman"变为"The women"。
2. 复数句转单数时，"There are"变为"There is"，"cars"变为"a car"。
3. 单数名词变为复数时，"He has"变为"They have"，"book"变为"books"。
4. 单数疑问句变为复数时，"Are these"保持不变，"dictionary"变为"dictionaries"。
以上是初中英语句型转换中常见的语法点，通过这些练习可以帮助学生巩固和理解不同句型的变换规则。
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