Question

I received your letters, I see the aeroplane, He finished his homework, I am opening the door, change into past perfect continuous​

Answer 1

I had been receiving your letters.

I had been seeing the aeroplane.

He had been finishing his homework.

I had been opening the door.

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Answer 2

Answer:

1. I had been receiving your letters.

2. I had been seeing the aeroplane.

3. He had been finishing his homework.

4. I had been opening the door.