Does he have less English than the other students in the class? Can you have him placed at a more appropriate level?
If not, the first thing you need to do is provide him the vocabulary he needs. Make him learn a few stock phrases, such as "What does this word mean?" and "Please repeat." Once he has a few words and phrases he can say, make it a rule that he has to try to speak English first. Let him, force him to struggle a bit, and praise him when he does.
Find out his interests and why he is studying English in the first place. Work with his motives the best you can. For example, if he loves cricket, talk about the English used in cricket.
Is he a perfectionist? You will need to tell him that he MUST make mistakes to do well in your class. He just needs to make new mistakes, not the same mistakes over and over again. And encourage him to ask questions, mostly in English.
See if other students can help him, too. If you have an excellent student who often finishes quickly, maybe that student can help explain to your struggler. Tell your good student that teaching is an excellent way to learn, so it �s good for both students. (If you give grades, you might also offer some extra credit.) However, be sure the good student HELPS and doesn �t DO the work for your lower-functioning student.