昨日 の 宿題 は まだ して いません。kinou no shukudai wa mada shite imasen.
I haven't done yesterday's homework yet.

Breakdown of kinou no shukudai wa mada shite imasen.
はwa
topic particle
のno
possessive case particle
いるiru
to exist; to stay; to have (used for living beings)
するsuru
to do
昨日kinou
yesterday
まだmada
still, yet
宿題shukudai
homework
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