Choose and write two sentences using simple past tense, then change them into negative andinterrogative forms.

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David had been waiting for his mother in front of the school. His mother usually fetched him from school but today she was not there. David waited for 15 minutes before he walked home by himself.

When he reached home, he knocked on the door as he did not bring the keys. Surprisingly, no one answered the door. David knocked again but still no one answered the door. Just as he was about to go to the nearby coffee shop where his father worked to get the keys, he heard the friendly voice of his neighbour, John.
David told him that no one was home and John's mother suggested that David stayed in their house till his mother came back. David and John played happily till evening when David's mother came back.
David thanked John and his family before he went back into his house. David's mother explained to David that she had a backache and she had to see a doctor.
From this experience, David learnt an important lesson, "Neighbours are people who help each other."​