"Grammar mistakes"

After reading Catalina’s blog I noticed that she has some grammatical mistakes but I have to say that she is very good at descriptions. She can express what she wants to say and this is very important because as readers we can understand her. I compared her last 2 posts and I found similar errors. For example I identified wrong use of word (WW), also punctuation mistakes (P), wrong spelling (WS) and finally wrong tense (WT).