Well, it all depends on the level of proficiency, personal goals, time frame, willingness and problem areas of the child. In general my approach would be to work on the weaknesses - one at a time, incorporate pictures, real objects, cd's, music, role-play, maybe some games (like: say a word that starts with the last letter (or sound) of my word) and conversations - discussions as close to the child's interests and personal experiences as possible (provide some examples of the sentences that could be used to start and finish, f.ex. In my opinion...., I agree...., I believe, etc; helping questions (or ask them along), key vocabulary). You might also use a graphic organizer or partially blank dialogs (just to aide speaking).....Smile, be energetic and prise a lot for accomplishments .
I hope it helps, however, I have to explain, that I teach kids in American schools. My ESL experience regards adults.