добавят

In a sentence

• В следующий раз они добавят больше соли в суп.

  Next time, they will add more salt to the soup.

  Here, 'добавят' is used to describe the action of adding more quantity (salt) in the future.

• Учителя добавят новую тему в учебный план.

  The teachers will add a new topic to the curriculum.

  In this sentence, 'добавят' refers to the act of augmenting the list of topics by including an additional one.

• Когда вернутся мастера, они добавят ещё один слой краски.

  When the painters return, they will add another layer of paint.

  Here, 'добавят' indicates the process of layering or applying an additional amount.