Taking a wild guess here, The word subject is used in the sense of 'niche' or 'branch' of knowledge on the other hand the word theme is used in the sense of 'the centrial point' of a subject or a topic.
What are robots? Robots are machines fictional and non-fictional that can be used for helping or destruction. People like robots because of all the exciting things you could possibly make it do, like be a robot butler, or a cleaner robot. People are making improvements on robots today to help people, they are also used in the army. In movies, comedy versions of robots are robot butlers and cleaners, but sometimes gets tired of doing their bosses work and turns evil. Robots are very useful, and maybe someday we can change the world with robot machines to help us out. <em>I Hope this helps you! :)</em>
Dear Diary,
Today wasn’t a good day, I actually woke up late for the first time. I got to school late and my teacher started to complain about it as if it wasn’t my first time being late! I completely felt embarrassed, she said all this in front of the whole class. Tonight, I have to make sure that I set my alarm to make sure I won’t have another day like today.