interlanguage influences, vocabulary system, grammar, methodological tools, adapted syllabus

Abstract
The article introduces a methodological approach to teaching English as a second language (ESL) to schoolchildren with general speech underdevelopment and identifies the main interlingual influences. The research featured various means that optimize the English language acquisition by schoolchildren with general speech underdevelopment. The research objective was to identify and substantiate the optimal methodological tools that take into account interlanguage influences. The study revealed the causes of the poor native grammar skills in this group of schoolchildren. A longitudinal study of interlingual influences made it possible to define several methodological tools that are able to improve the process of ESL acquisition by schoolchildren with general speech underdevelopment. These tools take into account the native vocabulary skills in children of this category. The authors propose to create additional adapted ESL syllabuses for schoolchildren with general speech underdevelopment. Such programs should be based on the peculiarities of the native vocabulary and grammar development in this category of children.