Abstract: Techniques are described for an automated grammar teaching system that displays sentences and allows a user to identify parallel structure errors within the sentences, if any. The user may be asked to determine whether the sentences have a parallel structure error, to identify the items that should be made parallel in structure, to select items to be changed from the identified items, and to provide corrections to the selected items so that all the items form consistent parallel structures. Multiple parallel structures may be valid and accepted as correct for a given parallel structure error. To guide the user, user responses may trigger the display of remediation information, which may include reasons why the selected items are incorrect. New sentences in the teaching system may be selected based on historical data maintained for the user.

Abstract: Techniques are described for an automated grammar teaching system that displays sentences and allows a user to identify pronoun errors or noun phrases that should be replaced with pronouns within the sentences, if any. The user may be asked to complete one or more of the following: to determine whether the sentences have a pronoun error or a noun phrase that should be replaced by a pronoun, to identify the type of the pronoun error, to identify the antecedent or core nouns that determine a plurality of the antecedent, to select a replacement sentence to best correct the pronoun error, and/or to locate an incorrectly displayed pronoun or a noun phrase and type a replacement pronoun. To guide the user, user responses may trigger the display of remediation information, which may include reasons why the user response is incorrect.

Abstract: Techniques are described for an automated grammar teaching system that displays sentences and allows a user to identify subject-verb agreement errors within the sentences, if any. The sentences may be presented as single sentences or as part of a paragraph. The user may be asked to determine whether the sentences are correct or incorrect, to identify the locations of verbs that should agree with a subject of the sentence, to identify the core noun that determines whether the subject is singular or plural, and to provide a new verb that agrees with the subject. To guide the user, user responses may trigger the display of remediation information, which may include identifying one or more grammar elements of the sentences that are relevant to identifying the subject-verb agreement errors. New sentences in the teaching system may be selected based on historical data maintained for the user.

Abstract: A grammar teaching system provides adaptive practice to build students' grammar skills with respect to verb tense errors. The system displays a sentence to a user, and allows the user to identify the locations of verbs within the sentence and tenses of the identified verbs. The system reinforces correct designations of verbs using visual cues. If a user incorrectly identifies a term as a verb within a sentence, then the system displays information to help the user understand the nature of the incorrectly designated term. The system allows the user to determine whether the sentence includes a verb tense error and to select a particular verb in the sentence to replace in order to correct any verb tense error. The system allows the user to obtain help in correcting a verb tense error by providing optional tasks that step the user through the reasoning needed to correct the error.