Not yet: non ... ancora
To say that something hasn't happened "yet", Italian uses non before the verb and ancora after it. When using a compound tense like the passato prossimo, ancora is typically placed right between the helper verb and the past participle.
| They have not changed this area yet. | Non hanno ancora cambiato questa zona. |
| They have not demolished the old factory yet. | Non hanno ancora demolito la vecchia fabbrica. |
Not anymore: non ... più
To express that a situation is "no longer" happening or "not anymore", wrap the conjugated verb with non and più.
| The worker is not in the construction site anymore. | L'operaio non è più nel cantiere. |
| The city was growing a lot, but today it is no longer growing. | La città cresceva molto, ma oggi non cresce più. |
Changing plans and urban development
You will frequently use these negative structures when talking about urban development (lo sviluppo) and ongoing construction projects.
If your sentence uses a modal verb (like volere, dovere, or potere) followed by an infinitive, più and ancora usually go immediately after the conjugated modal verb.
| They no longer want to demolish this skyscraper. | Non vogliono più demolire questo grattacielo. |
If you need to use a direct object pronoun (like lo or la), it slips right between non and the conjugated verb.
| They wanted to renovate the museum, but they have not changed it yet. | Volevano rinnovare il museo, ma non lo hanno ancora cambiato. |