Qual é a diferença entre catch up with e brush up on ?Podes indicar apenas respostas exemplo.

To catch up with is to get information on something that you have not known yet. An example would be, you were sick and had to stay home for a few days. On the day you go back to school, you would have to "catch up with" the subjects and assignments that you have missed. Another example would be "catching up with" a friend that you have not seen for a few years.

To brush up on basically means "to review." Brushing up is when you know your material, but go back and review it to hone it, or improve it. An example would be "to brush up on" your skills, "brush up on" your notes before a test.