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English Grammar: Complementation and Word Classes Explained

Studying English grammar can sometimes feel like navigating a complex maze. Two crucial concepts that often puzzle students are complementation and word classes. Mastering these elements is key to truly understanding how sentences are constructed and how meaning is conveyed.

This comprehensive guide will break down complementation, explore the various word classes, and delve into the nuances of word forms and specialized categories like pro-forms and wh-words. Get ready to clarify these important aspects of English grammar!

TL;DR: Quick Summary of Complementation and Word Classes

• Complementation: Essential grammatical elements required or implied by verbs and adjectives to complete their meaning. It clarifies what a verb deceives or what an adjective is subject to.
• Word Classes: Traditional categories of words (like nouns, verbs, adjectives) divided into two main types:
• Closed Classes: Fixed, rarely extended categories (e.g., prepositions, pronouns, determiners).
• Open Classes: Continuously growing categories (e.g., nouns, full verbs, adjectives).
• Special Word Categories: Numerals (infinite but rule-bound) and Interjections (grammatically peripheral).
• Meaning vs. Form: While word classes have typical semantic leanings (e.g., nouns are stative, verbs are dynamic), these aren't strict definitions.
• Pro-forms: Words or phrases that substitute for other expressions to avoid repetition and simplify sentences (e.g., he for the man).
• Wh-words: A special set of pro-forms used for asking questions or introducing subordinate clauses, always appearing at the beginning of their clause.
• Word Forms: Differentiating between a lexical item (the dictionary entry) and grammatical word-forms (its inflected variants in use, like work vs. works). Understanding homonyms (words spelled/sounded alike but unrelated) and homomorphs (words sharing morphological form but different function).

Understanding Complementation in English Grammar

Complementation refers to elements that are necessary to complete the meaning of certain words, primarily verbs and adjectives. Without these elements, the sentence often feels incomplete or grammatically incorrect.

Obligatory vs. Optional Complementation

Some words absolutely require a complement for their meaning to be understood. For example:

• The verb deceive needs an object: He deceived his father. (You can't just say He deceived.)
• The adjective subject needs a complement: All sales are subject to tax. (You can't say All sales are subject.)

In these cases, the meaning X deceives Y or X is subject to Y demands that Y is specified. Its omission makes the clause incomplete.

However, other complements are optional. Even if omitted, their presence is still implied:

• Joan was eating (her lunch). (It's implied Joan was eating something).
• The boat was ready (for departure). (It's implied the boat was ready for something).

The function of these optional elements is still complementation because their absence leaves a semantic