六年级下Unit3Whenisyourbirthday
六年级下Unit1 When is your birthday?序数词:基数词变序数词口诀基变序有规律,一二三特殊记,th从四加起.八去t,九去e,五十二f把ve替.从二十到九十y变i加eth.若遇到
六年级下Unit3Whenisyourbirthday