What I learned in this class

I made some speaches in this class. Then, I learned many things.

First, I learn how to use "but", "and", "because" ,"so", "however" and "wherease". I had be wrong how to use them.

Second, I knew that there were a main idea, a topic sentense, sapporting sentences and a concluding sentense in a speach. You may think that these is natural things. However, you will overlook them, if you are not conscious.