1. You have to understand their way how they are adapting things.
2. You have to keep patience and politeness.
Remember that, it is not the children fault it is the teacher fault if he/she failed to make them understand.
Do one thing, start teaching kids nearby, you will get idea.
Don't be afraid to ask others, do research, and attend professional development trainings. Your Special Needs teachers, speech-language pathologist, and/or school psychologist can help you with ideas and strategies. Just be willing to try it and implement the plan with fidelity.