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Abstract
English Language is a great historical bequest inherited by Nigeria from the colonial masters. The language swiftly found its place in all levels of administration in government, schools, media and inter-ethnic integration in Nigeria. Despite this conspicuous position occupied by the 1anguage in Nigeria, it has been assailed by myriad of grammatical-syntactic errors which give navigation, purpose and aim to this research. The researcher used syntax, particularly Chomsky's phrase structure grammar as theoretical frame work. The researcher adopted combined methods of universal and classroom observation by Skinner (1965), and purposive sampling by Bernard (2002), as methods of data collection. The researcher also used descriptive grammar as method of data analysis Ndimele (2008). Through this research, the researcher found out that Grammatical-syntactic errors emerge in two forms: intra-linguistic errors and inter-linguistic errors, having the former heavily linked to mother tongue interference and the latter linked to the student's over-generalization, over confidence and wrong assumption due to inadequate knowledge in the target language. Beside the usual grammatical and lexicon errors investigated by most researcher's, Discourse errors, a latent error dimension was scratched open by the researcher along side with mechanical errors in grammar; and the need to curtail the influx of both American and British standards of English in one piece of essay. Keywords: Essay, Errors, Syntactic, Writing, School