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That's a hard one! If you haven't used good speech for very long, it will be really difficult to remember to do it when you have to ask or answer a question, read, or give a presentation. Instead of concentrating on the times you forget to use good speech, set yourself a goal of using good speech once a day for a week, then twice a day for a week, then three times, and so forth. Congratulate yourself for meeting your goal, don't be hard on yourself for not using good speech at the other times. By the end of the school year, you will be using good speech all day!
Think about how you feel when you have to speak in class. Do you feel rushed? Do you feel like people are staring at you, or that the teacher wants you to hurry up and get on with it? If you do feel like this, you should talk to your parents, teacher or speech teacher, and together you can figure out ways to lighten up the pressure a little. Otherwise, just expect that sometimes you will forget to use good speech. That's really OK. As long as you don't get discouraged, you will eventually learn to use good speech without really thinking about it too much. But it can take a long time to learn to do that.
Here's something else that you can do secretly for yourself. Next time you have question-and-answer time or oral reports in class, mark down on a piece of paper the number of times the other kids have to stop and start again, make a speech mistake, repeat a word or a syllable, or goof up some other way. I bet you'll be surprised! You might want to talk about that tally with your speech teacher. You see, everyone screws up speaking sometimes, so stuttering now and then really should not be that much of a problem.
How do you remember to use good speech in school, do you have any tips?