1
7 + plural noun
I bought 7 books.
我买了7本书。
七
先理解核心含义，再看它在真实句子里的用法。
七
seven
I bought 7 books.
我买了7本书。
比六多一个
being one more than six
There are 7 days in a week.
一周有7天。
She put 7 books on the shelf.
她把7本书放在书架上。
The bus arrives in 7 minutes.
公交车7分钟后到达。
I bought 7 books.
我买了7本书。
定冠词后接数字7和复数名词，表示特指的一组七个事物。
The 7 wonders of the world attract many tourists.
世界七大奇观吸引了许多游客。
表示整体中的一部分，数字7后接of短语。
7 of the students passed the exam.
学生中有7个通过了考试。
表示年龄，7用作形容词补语。
My daughter is 7.
我女儿7岁。
Not this
I read 7 chapter yesterday.
Use this
I read chapter 7 yesterday.
中文语序常将数字置于名词前（如'七章'），但英语中表示编号时，数字常置于名词后。因此，应将'7 chapter'改为'chapter 7'。
Not this
I have 7 book.
Use this
I have 7 books.
中文名词无复数变化，但英语中可数名词前有数字时需加-s表示复数。应改为'books'。
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Dictionary facts from ECDICT, WIKTIONARY.