Infinitives, Verb Tenses, and Passive Voice

A noun is a word that names a person, place, thing, or idea.

A singular noun refers to one person, place, thing, or idea. A plural noun refers to more than one.

The plural form of most nouns is formed by adding -s or -es.

Irregular nouns have unique plural forms that do not follow the general rules.

Collective nouns refer to a group of people, animals, or things.

Common nouns refer to general people, places, things, or ideas.

Proper nouns refer to specific people, places, things, or ideas.

Concrete nouns refer to things that can be seen, touched, heard, smelled, or tasted.

Abstract nouns refer to ideas, qualities, or concepts that cannot be physically perceived.

A noun phrase is a group of words that functions as a noun.

An article is a word that comes before a noun to specify its definiteness or indefiniteness.

The definite article 'the' is used for specific nouns that have already been mentioned or are understood.

The indefinite article ‘a’ is used for singular, countable nouns that are not specific.

The indefinite article 'an' is used before singular, countable nouns that begin with a vowel sound.

Countable nouns refer to things that can be counted individually.

Uncountable nouns refer to things that cannot be counted individually.

A verb is a word that describes an action, state, or occurrence.

The base form of a verb is the infinitive without 'to.'

The present tense describes actions that are happening now or regularly.

The past tense describes actions that happened in the past.

The future tense describes actions that will happen in the future.

The verb 'to be' is irregular and changes form in each tense. Present: am, are, is. Past: was, were.

Regular verbs form the past tense by adding -ed to the base form.

Irregular verbs have unique past tense forms that do not follow the general rules.

An adjective is a word that describes a noun or pronoun.

Adverbs modify verbs, adjectives, or other adverbs.

A pronoun is a word that replaces a noun or noun phrase.

A preposition is a word that links a noun or pronoun to another word in the sentence.

A conjunction is a word that joins words, phrases, or clauses.

An interjection is a word or phrase that expresses a sudden emotion or feeling.

A sentence is a group of words that expresses a complete thought.

A phrase is a group of words that do not contain a subject and a verb.

A clause is a group of words that contains a subject and a verb.