1.361985472
2.5712346101198
3.(1)Forty-threedollars(2)Fifty-sixeighty-nine/fifty-sixdollarsandeighty-ninecents.
(3)Sixty-eightyuan
(4)onehundredandninetysixtyfour/onehundredandninetydollarsandsixtyfourcents
(5)ninetypounds(6)twenty-fivefifty/twenty-fivedollarsandfiftycents
(7)seventy-eightpounds(8)seventy-eightseventy/seventydollarsandseventycents4.
(1)直接加s：orangesdaysfriends
(2)在以s，x，sh，ch結尾和部分以o結尾的名詞後加es：classesbusesboxesfoxes
watchesbrushestomatoespotatoes
(3)以輔音字母加y結尾的'名詞去y變爲ies：countriesfamiliesbabies
(4)以f，fe結尾的名詞去f，fe變ves：shelfshelvesleafleavesknifeknives
(5)不規則變化：childrenfeetteethmenwomensheep