HSK 1 grammar · pattern
个
Number + measure word + noun
Pattern
+ +
( ) can be left out · other words may come before, between and after
How it works
A number cannot attach straight to a noun; a measure word goes between them. 个 is the general one, but many nouns take their own (本 for books, 只 for animals).
Examples
我有一个问题。
Wǒ yǒu yí ge wèntí.
I have a question.
我买了三本书。
Wǒ mǎi le sān běn shū.
I bought three books.
Related

See it in a story
In the app, 个 is underlined wherever it appears in the stories you read, and practised with sentences from them. Free.