3 I listened to music ... while I did my homework. when I'd done my homework.

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ФИО:Телефон:Емаил:Полное описание сути нарушения прав (почему распространение данной информации запрещено Правообладателем):

Accepted Answer

while I did my homework.

This implies that I listened to music at the same time I was doing my homework. The actions were simultaneous.

when I'd done my homework.

This implies that I listened to music after I had finished my homework. The homework was completed before the listening began.