Somebody sang a song. I didn't know it. (I/not hear/it/before)
I hadn't heard it before.
I invited Rachel to the party, but she couldn't come. (she/arrange/to do something else)
She had arranged to do something else.
We went to the cinema last night. We got to the cinema late. (the film/already/start)
The film had already started.
Last year we went to Japan. It was our first time there. (we/not/be/there/before)
We hadn't been there before.
Sam played tennis yesterday. He wasn't very good at it because it was his first game ever. (he/never/play/before)
He had never played before.
