I washed my son's shoes yesterday, but they were still wet this morning, so I had to buy him another pair.
ーI washed my son's shoes yesterday, but they were still wet this morning, so I had to buy him another pair.
「昨日息子の靴を洗ったが、今朝まだ濡れていたので、もう一足買わなければいけなかった」
to wash one's shoes で「靴を洗う」
they were still wet で「（靴が）まだ濡れている・乾いていない」
to buy ... another pair で「もう一足買う」
ご参考まで！
カナダ 
