My Subject/Object Question

Today has been a normal day for me.
During the morning class I review how to use a new words that I had been using during the week and review the topic about Subject and Object question, but I noticed that I have problems making that kind of questions, for that I decided start to review the topic about what is a subject and what is an object, because even in my own language I have problem identifying that elements in a phrase.
That was during the morning but when I was eating my lunch I realised that I was going to the wrong class in the afternoon, I was going to the 13 classroom but I should go to the 12 classroom, was so funny for me