1
5 + noun
数字直接修饰名词，无需冠词。
I have 5 apples.
我有5个苹果。
五
先理解核心含义，再看它在真实句子里的用法。
五
being one more than four
I have 5 apples.
我有5个苹果。
比四多一个的
being one more than four
She bought 5 apples at the market.
她在市场上买了五个苹果。
We have 5 minutes before the bus leaves.
公共汽车出发前，我们还有五分钟。
The box contains 5 books for the class.
这个盒子里装着给这个班用的五本书。
数字直接修饰名词，无需冠词。
I have 5 apples.
我有5个苹果。
表示年龄时，数字直接放在be动词后。
He is 5 years old.
他5岁。
Not this
He finished 5 in the race.
Use this
He finished 5th in the race.
中文序数需加“第”，而英语用后缀-th，学习者易忽略。
Not this
I have 5 book.
Use this
I have 5 books.
大于1的数词后名词须用复数，中文无此变化，故易遗漏-s。
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Dictionary facts from ECDICT, WIKTIONARY.