# English

1. When I entered the room, he played the piano.

2. When I entered the room, he started to play the piano.

(Is #1 grammatical? Is #1 similar to #2?)

3. When I entered the room, he had been playing the piano for an hour.

4. When I entered the room, he was playing the piano.

(Are both grammatical?)

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1. All 4 are grammatically correct.

The first two are close, but don't mean exactly the same thing. In #1, it isn't clear if he started playing when "I" entered or if he had already been playing and then he continued.

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