Question

The sentence is in the Present Continuous, in the Past Continuous would be: "Janet is brushing
her teeth now".
O Janet brushed her teeth yesterday.
Janet was brushing her teeth yesterday.
Janet does brush her teeth every day.
O Janet is brush her teeth now.
Janet brushes her teeth every day.

Answer 1

Resposta:

No Past Continuous, a frase fica: Janet was brushing her teeth yesterday.

Explicação:

O Past Continuous é formado pelo verbo auxiliar to be no passado simples (was, were) + verbo principal no gerúndio (terminação ing).  

Ex. I was reading the news.

Repare que depois do sujeito "I" temos o verbo to be no passado simples, logo após o verbo to read no gerúndio(terminação ing).

No exemplo da questão, que está no Present Continuous, basta alterar o verbo to be no presente simples ( is na terceira pessoa) por was no passado simples e alterar o advérbio de tempo, no caso now por yesterday:

Janet was brushing her teeth yesterday.

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