French makes comparisons with plus... que (more... than), moins... que (less... than), and aussi... que (as... as), placed around the adjective: elle est plus grande que moi (she is taller than me), ce livre est moins cher que l'autre (this book is less expensive than the other), il est aussi intelligent que sa sœur (he is as smart as his sister).
One common adjective is irregular: bon (good) becomes meilleur (better) in comparisons, not plus bon — ce restaurant est meilleur que l'autre, never plus bon que. The adverb bien similarly becomes mieux (better) rather than plus bien.