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结尾和部分以o结尾的名词后加es：classesbusesboxesfoxes
watchesbrushestomatoespotatoes
(3)以辅音字母加y结尾的'名词去y变为ies：countriesfamiliesbabies
(4)以f，fe结尾的名词去f，fe变ves：shelfshelvesleafleavesknifeknives
(5)不规则变化：childrenfeetteethmenwomensheep