英语改复数step-son step-mother step-brothersister-in-law parent-in-lawboot half mouth heat money cow Egyptian dress tennis wood chicken music homeword bread blood milk dustman Englishwoman news advice cotton knowledge tear cloud mice oxen里面也有不可数名词的额
问题描述：
英语改复数
step-son step-mother step-brother
sister-in-law parent-in-law
boot half mouth heat money cow Egyptian dress
tennis wood chicken music homeword bread blood
milk dustman Englishwoman news advice cotton
knowledge tear cloud mice oxen
里面也有不可数名词的额
答
step-son step-mother step-brother
sister-in-law parent-in-law 在 son mother brother sister parent 上加复数 sons mothers brothers sisters parents；
boots halves mouths heat money cows Egyptians dresses
tennis wood（柴火wood 如果是森林woods）chicken music
homeworks bread blood milk dustmen Englishwomen news advice
cotton knowledge tear cloud mice oxen
不变的都是不可数名词