One of the eight parts of speech, adjectives are a type of modifier. They serve the same purpose in French and English, but they are very different in two respects.
By definition, adjectives modify nouns. But more than 30 French adjectives can sometimes modify verbs instead, thus taking on the role and characteristics of adverbs, including the fact that they are invariable.
Vous can be every type of personal pronoun, but its role as a subject pronoun may be the trickiest because of agreement.
Most French verbs are conjugated with avoir as their auxiliary verb in compound tenses and moods, and therefore do not require agreement with their subjects. But avoir verbs do need agreement in a very specific construction: the past participle must agree with the direct object when it precedes the verb.
All pronominal verbs are être verbs in compound tenses and moods like the passé composé, which means that the past participles must agree with their subjects - at least in theory. In fact, it's not quite so straightforward.
The three French verb constructions which include some form of être plus a past participle usually require grammatical agreement of the past participle with the subject.
Verbs of perception are subject to grammatical agreement in the compound tenses, but the rules are somewhat tricky - they only agree with their subjects when they precede the verb.
An article is a word that modifies a noun in a particular way, by stating whether the noun is specific, unspecific, or partial. There are three types of French articles, and they all agree in gender and number with the nouns they modify.
Certain aspects of French grammar are a bit different with the causative than with other two-verb constructions.
The French definite article (le, la, l', les) indicates either a particular noun or, contrarily, the general sense of a noun. It's used similarly to its English counterpart, but there are many instances where a definite article is required in French but not English.
Impersonal pronouns do not have different forms for each grammatical person, though some have different forms that agree with the nouns they replace.
Indefinite pronouns are vague - they either refer to unspecific nouns (like un autre and quelque chose) or make sweeping generalizations (on, tout le monde).
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Adjectives comprise one of the eight French parts of speech, but certain members of other grammatical categories can sometimes be used as adjectives. These "non-adjectives" are invariable: there's no gender/number agreement with the nouns they modify.