перевести на английский и составить: положительное, отрицательное, общий, специальный, и вопрос к подлежащему
Предложение: мы только что позавтракали
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+ We have just had breakfast.

- We haven't had breakfast yet.

* General Question:

Have we // Have you just had breakfast?

* Special Question:

What have you just had?

* Special, to the Subject:

Who has just had breakfast?

* Tag Question:

We have just had breakfast, haven't we?