To express not yet in Spanish, you use the negative expression todavía no with El Pretérito Indefinido.
Look at these examples:
todavía no + verb conjugated in El Pretérito Indefinido
However, note that you can also use it in the following order:
The negative expression todavía no means not yet, but todavía used on its own has a different meaning = still or even.
See also When to use the perfect tense versus the simple past (Perfecto vs Indefinido)
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