for example, teacher raises a question in the class and out of all the class only a few students or only one student raises to answer the query.the teacher should encourage the student although he gives a wrong answer.in dis way positive should be enlightened. enlightening the only positive with out giving a tenuous look at negative is also not a good thing.the teacher should give priority to both the things .hierarchy in this is positive and then negative.
It's a golden rule that you start your sentences with capital letters. May be this is just a draft, but the purpose is writing an essay and not sending an sms. It's pretty difficult for us also to read your contents carefully when you do not present it in a tidy manner. Please don't make this mistake in your future postings.
Overall, I feel you need to concentrate on your essay structure as dumi suggested above. Plus, you need to pay lots of attention to the clarity of your sentences. Be more clear with the idea you are going to write about and then write a clear, preferably shorter, sentence.