In other words, they are the 'glue' that holds the sentence together.[1] Functional items can also be classified as closed class, that is, belonging to parts of speech that do not easily allow new members.[1] If functional items are removed from a sentence, the words that would be left are the lexical items. The lexical items of a sentence are those that are used in telegraphic speech; functional items are the grammatical units that hold the sentence together and make it more fluid.[2] Functional Items are feature sets.