If the subject is singular and masculine:
* Est en train de grandir: This is the most common and versatile way to say "is growing".
* Grandit: This is a simpler and more concise option, meaning "grows" or "is growing".
If the subject is singular and feminine:
* Est en train de grandir: This is still the most common and versatile way to say "is growing".
* Grandit: This is still a simpler option, meaning "grows" or "is growing".
If the subject is plural:
* Sont en train de grandir: This is the most common and versatile way to say "are growing".
* Grandissent: This is a simpler option, meaning "grow" or "are growing".
Examples:
* L'arbre est en train de grandir: The tree is growing.
* La plante grandit: The plant is growing.
* Les enfants sont en train de grandir: The children are growing.
* Les fleurs grandissent: The flowers are growing.
Remember that the conjugation of the verb "grandir" will change depending on the subject's gender and number.