Упражнение 268 на употребление Past Perfect

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Измените глаголы, чтобы время изменилось с настоящего на прошедшее.
Например,
I'm not hungry. I've just had a snack. →
I wasn't hungry. I had just had a snack.


I've heard the song before but I don't know the singer. 

→ I the song before but I the singer.