These- pronoun, adjective. 1. Plural of this.
Two- noun. 1. A cardinal number, 1 plus 1.
Sentences- noun. 1. Grammar. A grammatical unit of one or more words that expresses an independent statement, question, request, command, explanation, etc., and that typically has a subject as well as a predicate. In print or writing a sentence typically begins with a capital letter and ends with appropriate punctuation; in speech it displays recognizable, communicative intonation patterns and is often marked by preceding and following pauses.
