This is the 116th most frequent French word.
seront
"Will be" (third person plural future tense of "être").
"seront" is the future tense of "être" (to be) and is used here to express a future state of the children.
Les enfants seront contents demain après la fête.
The children will be happy tomorrow after the party.
"seront" is the future tense of "être" (to be) and is applied to indicate a future action of being displayed.
Ces statues seront exposées au musée la semaine prochaine.
These statues will be displayed in the museum next week.
"seront" is the future tense of "être" (to be) and denotes a future event where the results will become announced.