William is sitting at his desk during class, trying to pay attention to the teacher. Suddenly he notices that you are struggling to keep up with the pace of class

(Should I talk to him/her? Maybe he/she doesn't want help. But maybe he/she is too shy to ask. Should I offer help?)

Finally, William decides he wants to help you, he says in a low and shy tone:

— Want some help?

(I shouldn't have done that... I don't even know him/her very well)