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The purpose of this paper is to show that the information structure is a basic component of the English language which interacts with phonology, syntax and semantics as well as pragmatics. The information structure marks the organization of sentences into focus and topic constituents. Focusing plays a central role in grammar, and the identification of a topic is characteristic of linguistic structure. The linguistic level of information structure is a fundamental part of Universal Grammar which determines the class of possible languages. Information structure mediates grammar and phonetic form. It is necessary for the derivation of intonation and phrasal accent. In English topic identification is an innate and essential pan of conceptual-intentional structure itself, and focusing is an innate reflex ,essentially involved in perception as a whole. The canonical information structure in English takes the grammatical subject or alternatively a stage as a sentential topic, whereas languages like Japanese and Korean have morphological markers to make the topic prominent. Different languages have their own canonical information structures. The connection between basic word order and the fixed positions for the focus has been discussed by many linguists but their information structure-oriented approach prompts various perspective on this problem. This paper introduces three types of information structure proposed by Lambrecht (1994) and reinterprets them by the Erteschik-Shir's f-structure rules. By looking at English sentences from above, information structure analysis enables us to understand English grammar as an ecological system.