Here are some examples of how "schlau" is used in a sentence:
* "Er ist ein schlauer Junge." (He's a clever boy.)
* "Sie hat eine schlaue Idee." (She has a smart idea.)
* "Die Leute waren sehr schlau, die Geschichte zu durchschauen." (The people were very shrewd to see through the story.)
You can also use "schlau" as an adjective to describe something that is cleverly designed or made:
* "Das ist ein schlauer Trick." (That's a clever trick.)
* "Das ist eine schlaue Maschine." (That's a clever machine.)