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The term "grammatical category" refers to specific properties of a word that can cause that word and/or a related word to change in form for grammatical reasons (ensuring agreement between words).

For example, the word "boy" is a noun. Nouns have a grammatical category called "number". The values of number are singular (one) and plural (two or more).

1. The boy is playing.
2. The boys are playing.

In sentence 1, "boy" is in its basic form, giving its "number" the value of singular. There is one boy and the related auxiliary verb "to be" is in the singular form (is).

In sentence 2, the form of "boy" has changed to "boys", giving its "number" the value of plural. There is more than one boy and the related "to be" is in the plural form (are).

In the above example, the "number" of "boy" influences the form of boy, and also influences the form of a related word (be). "Number" is a "grammatical category".

English has over twenty grammatical categories. Below we list the most common ones for English learners and summarize their main features.

Voice

Voice is a property of transitive verbs*, and expresses the relationship of the subject to the action. Voice has two values:

• active: the subject does the action
• passive: the subject receives the action

Number is a property of nouns and pronouns, and indicates quantity. Number has two values:

• singular: indicates one only
• plural: indicates two or more

Case is a property of pronouns and nouns, and expresses their relationship to the rest of the sentence. Case has three values (two of which do not apply to nouns):

• subjective (pronouns only): when the word is the subject
• objective (pronouns only): when the word is the object
• possessive (pronouns and nouns): when the word indicates possession (ownership)

Natural gender is a property of pronouns, and differentiates the sexes. Natural gender has three values:

• masculine: indicates male
• feminine: indicates female
• neuter: indicates everything else

Person is a property of pronouns, and differentiates participants in a conversation. Person has three values:

• first person: refers to the speaker
• second person: refers to the hearer
• third person: refers to all other people or things

Tense is a property of verbs, and most closely corresponds with location in time. Tense has two values:

• past: indicates before now
• present: indicates now (and sometimes before and after now)

Aspect is a property of verbs, and expresses our view of the time structure of an activity or state. Aspect has three values:

• simple: the time has no structure
• continuous: expresses ongoing action
• perfect: expresses completed action

Mood is a property of verbs, and relates to the speaker's feelings about the reality of what he is saying. Mood has three values:

• indicative: expresses simple statement of fact
• imperative: expresses command
• subjunctive: expresses something desired or imagined

Degree is a property of gradable adjectives and adverbs, and indicates amount. Degree has three values:

• positive: indicates a basic quality
• comparative: indicates a greater quality
• superlative: indicates the maximum quality