I just found out on Facebook this morning that a good friend of mine in the Czech Republic has been very sick with the flu for the past two weeks. Since all of the messages posted so far have been in Czech, I wanted to write something to her in Czech as well. What are some of the possible ways I could either write "have been so sick with the flu" or something similar to this in Czech? Here's the sentence I would like to write followed by my attempt at writing it in Czech: I am very sorry to hear that you have been so sick with the flu Kateřina. Jsem velmi líto, že jste byli tak nemocní s chřipkou Kateřina.