Very young children learn vocabulary items related to the different concepts they are learning. When children learn numbers or colors in their native language, they are adding concepts as well as vocabulary items. Coursebooks for YL often emphasize nouns because they are easy to illustrate and because often YL don?t have literacy skills, so the only words that can easily be featured are nouns. However, language is more than nouns and it is important to include verbs, adjectives, adverbs and prepositions and also different lexical fields (colors, animals, days of the week, food, jobs, etc.) as part of the vocabulary teaching. It is important to help them expand their vocabulary knowledge through formal (planned instruction: teaching the meaning of the words and ways to discover the meaning) and informal instruction (?by the way? instruction: with no rule or systematic approach). Both formal and informal vocabulary instructions are important to engage students? cognitive skills and to give opportunities for YL to use the words. Having different learning opportunities improves learners? overall language ability by improving their vocabulary. Teachers should facilitate vocabulary learning by teaching learners useful words and by teaching strategies to help learners figure out meanings on their own. Useful words are words that children are likely to encounter and words that occur in a high frequency.