Exercise 17.2: The correct auxiliary - past.

Fill in the blank with did, had, was or were.

Example: What ____ he doing at the time?
Answer: What was he doing at the time?

1. The train ____ not arrive on time this morning.

2. I ____ not mind at first.

3. I ____ reading a very interesting book.

4. I ____ not notice that the station was very quiet.

5. I ____ been waiting at the station for an hour.

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