Children (play) computer games when a policeman came.
Michael (not buy) food for poor people the whole day yesterday.
A nurse (feed) a patient when a doctor called her.

1. Children were playing computer games when a policeman came.

2. Michael wasn't buying food for poor people the whole day yesterday.

3. A nurse was feeding a patient when a doctor called her.

Объяснение:

1. Positive: subject + to be (I, he, she, it - was, we, you, they - were) + Ving

2. Negative: subject + to be (I, he, she, it - was, we, you, they - were) + not + Ving

3. Positive: subject + to be (I, he, she, it - was, we, you, they - were) + Ving

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