In English, generally speaking:
- Nouns (except pronouns) are usually marked for grammatical number, and sometimes grammatical case, definiteness and grammatical gender.
- Pronouns are sometimes marked for grammatical number, and sometimes grammatical case and grammatical gender.
- Verbs are marked for inflected tense and grammatical aspect.
- Modifiers are marked as being adjectives or adverbs, and in plain, comparative or superlative forms.
- Function words, such as grammatical articles, prepositions and conjunctions always act as markers.
It is worth noting that words may possess grammatical properties (such as number or gender), but not be marked for them.