Vocabulary Size and Vocabulary Learning Strategies

Please edit the existing literature review and add more information or delete unnecessary information. The paragraphs need restructuring. Please include a section on theoretical framework of the research at the beginning. If possible, the references need to be recent i.e. not more than 5-6 years before. Also, the topics needed to be included are vocabulary size (it's importance and relation to proficiency/fluency in English, how many words are needed to be learned by non-native speakers of English to succeed in school, what does it mean to know a word, the difference between receptive/productive vocabulary and its size measure), learning strategy in general and vocabulary learning strategies in particular although more emphasis on the latter (definitions from various scholars and the categories they use).