The purpose of the investigation reported in this document is to determine the range of errors in the spontaneous speech of Puerto Rican children of intermediate English ability in order to provide specific information on phonetic and morphological deviations from standard English for use in curriculum development. The study first considers common pronunciation problems, many attributed to the influence of Spanish. Problems with vowels, diphthongs, consonants, consonant clusters, stops, and spirants are discussed. Syntactic problems with auxiliaries, tense and number, object complements, negation, structures difficult to understand, and miscellaneous lexical items are also considered. Examples of the errors are provided. (VM)