文章标题：for前面是什么词
在英语语法中，"for"是一个非常常用的介词，它可以指代多种不同的含义和用法。以下是一些常见的"for"前面可能出现的词及其含义：
1. for example：用于举例说明，相当于“例如”。
例如："She has a lot of hobbies, for example, reading, painting, and cooking."
2. for instance：与"for example"相似，也是用于举例说明。
例如："This book is very helpful; for instance, it includes a glossary of terms."
3. for the purpose of：表示“为了……的目的”。
例如："The meeting was held for the purpose of discussing the new project."
4. for a while：表示“一段时间”。
例如："I was feeling ill for a while last week."
5. for years：表示“多年来”。
例如："She has worked in this field for years."
6. for sale：表示“出售”。
例如："The old car is for sale."
7. for free：表示“免费”。
例如："The museum is open for free on Sundays."
8. for sure：表示“肯定”或“确实”。
例如："I am for sure going to the party tonight."
9. for one：用于引出个人的观点或例子，相当于“就我个人而言”。
例如："For one, I think the new policy is a good idea."
10. for all：表示“尽管”或“虽然”。
例如："For all his efforts, he did not succeed."
常见问题清单：
1. What is "for" used for in a sentence?
2. What does "for example" mean?
3. How is "for instance" different from "for example"?
4. Can "for the purpose of" be used in formal writing?
5. How do you use "for a while" in a sentence?
6. What does "for years" mean in a sentence?
7. Is "for sale" always used in the context of selling something?
8. When should you use "for free"?
9. How do you use "for sure" in a sentence?
10. What does "for one" add to a sentence?
详细解答：
1. What is "for" used for in a sentence?
"For" is a versatile preposition used to indicate purpose, reason, direction, time, or a group of people or things. It can also be used to introduce a dependent clause or as a conjunction.
2. What does "for example" mean?
"For example" is used to introduce an example that illustrates or clarifies a point. It is often followed by a noun or noun phrase.
3. How is "for instance" different from "for example"?
"For instance" and "for example" are synonyms and can be used interchangeably. Both are used to introduce examples.
4. Can "for the purpose of" be used in formal writing?
Yes, "for the purpose of" is a formal expression used to indicate the reason or intention behind an action or event, and it is commonly used in formal writing.
5. How do you use "for a while" in a sentence?
"For a while" is used to describe a period of time that is not long or specific. Example: "I was out of town for a while."
6. What does "for years" mean in a sentence?
"For years" means a long period of time, often more than a few years. Example: "She has been working for the same company for years."
7. Is "for sale" always used in the context of selling something?
Yes, "for sale" is specifically used to indicate that something is available to be purchased.
8. When should you use "for free"?
"For free" is used when something is provided without any cost. It is commonly used in offers or promotions.
9. How do you use "for sure" in a sentence?
"For sure" is used to express certainty or confidence. Example: "I am for sure going to win this competition."
10. What does "for one" add to a sentence?
"For one" is used to introduce a personal opinion or viewpoint, often to emphasize that the speaker is speaking for themselves. Example: "For one, I think the new system is not userfriendly."
