Why does spoken French rely heavily on word order and agreement?

Spoken French relies heavily on word order and syntactic agreement because the language has undergone significant changes that resulted in the loss of many inflectional endings found in its parent language, Latin.12

While Latin used a complex system of case endings to indicate the grammatical relationships between words, these markers have largely disappeared in spoken French. For example, although plural markers like -s or -es are retained in writing, they are generally silent in speech. Similarly, while French verbs are conjugated for different persons, many of these forms are pronounced identically.12

Because these morphological markers are often absent or ambiguous in the spoken language, French has shifted toward a more rigid structure to ensure clarity. Consequently, the language places a much greater reliance on:3

• Word Order: The most frequent order in statements is subject–verb–object, which serves as the primary means to convey grammatical relationships.43
• Syntactic Agreement: Because overt markers are often missing from nouns themselves, gender and number distinctions are frequently expressed through the accompanying article or adjective.12

This evolution toward a reliance on syntax rather than inflection has been a defining characteristic of French since approximately the 14th century.3