you did not tell the exact age..anyway im a philippine and yu know when i was studing english its really more effective learn while understanding the meaning of each word...sometimes you should translate english word to korean(if youre teaching a korean child) to let them understand and its a great feeling for her/him learning this way(he can actually can express also himself in english)..so try giving vocabularies then after that you can follow teaching grammar
i dont know if this helped u but i wish somehow it did
try this site (translated koreanexpressions)
nasedek - basic korean expressions