Question

Sheila ________ a DJ before she was 19 ( tô become _ negativa )

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Answer 1

Resposta:

Sheila didn't/did not become a DJ before she was 19

Answer 2

Resposta:

Sheila did not became a DJ before she was 19.

Obs: "became" é como é conjugado o verbo "become" no passado.

         Alternativamente você pode usar "didn't" no lugar de "did not".