Some good tongue - twisters that can be done in class with students initially- say them altogether, then maybe they work on them in pairs. Practice saying in turn each tongue twister, slowly to start with and then try and get faster.
− Red lorry, yellow lorry
− She sells seashells on the seashore
− Ed had edited it
− Are you copper bottoming 'em maam? No, I'm aluminiuming 'em my man
− You know
New York, you need New York,
you know you need, unique New York
− She stood upon the balustraded balcony, inexplicably mimicking him hiccupping and amicably welcoming him in
§ Then can be practiced at home to develop the use of voice/ articulation by saying and repeating actual lines at home so that every word is clear.
§ Encourage the students to say them in front of a mirror so that they can see how much their mouth/ lips/ tongue have to move to get them right and clear!