A: I'm going to play basketball this afternoon.
B: I think you had better not.
B: We'll get ahead with a new lesson this afternoon.
exp. To progress or advance in some aspect of life.（取得进步，继续前进）
e.g. If this project goes well, it could really help me to get ahead at work.
e.g. He was talking about the way to get ahead with our business.
Just get ahead with your English.
go ahead with a new lesson：上新的一课