class
The German word Klasse is used in a similar way to the English word 'class'. It can refer to a group of students in a school, a category of things or people, or a level of quality or excellence. For example, 'Ich bin in der ersten Klasse' means 'I am in the first grade' or 'Ich fahre eine Luxusklasse' means 'I drive a luxury class car'.
That's a class by itself.
This phrase is used to describe something unique, suggesting that it belongs to a class of its own because it is incomparable.
We are in the same class.
This phrase is used to convey that the speaker and the person they are talking to share a class, usually in a school or educational context.
The class is very loud today.
This phrase can be used by a teacher or student to describe a noisy classroom environment on a particular day.