按要求寫詞1 peopie(單數)________ 2 thirty(序數詞)_________ 3 twenty-on

題目：

按要求寫詞
1 peopie(單數)________ 2 thirty(序數詞)_________ 3 twenty-one(序數詞)________ 4 waikman(複數)_______ 5 policeman(複數)________ 6 teachers(名詞所有格)________

解答：

1 people(單數) person
2 thirty(序數詞) thirtieth
3 twenty-one(序數詞) thirty-first
4 walkman(複數) walkmen
5 policeman(複數) policemen
6 teachers(名詞所有格) teachers