However, depending on the context, you can use different phrases to refer to the class:
* "It" can be used if you're talking about the class as a collective unit: "It is a challenging class."
* "They" can be used if you are talking about the students in the class: "They are all working hard."
* "We" can be used if you are part of the class: "We are learning a lot in this class."
Ultimately, the best way to refer to a class depends on the specific situation and what you are trying to communicate.