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You can help them -
. The first thing is - every day give some topics like - media, our world,  the ozone layer and many more simple topics ask them to speak in front of the whole class. if they are wrong or their pronounciation help them and correct. This will help them to correct their mistakes. Day by day they will improve. I am sure this help you.
First step is to start reading English newspaper and books and speak in front of mirror.I am sure that it will them