i need some money for the field trip.[美]
用不用”get some“这个要看语境了,看你这句话是和谁说的.
和家长的话,句前加上人称,如：hey mom,i need money for the field trip.
如果是表明你现在没空,或等会要去取钱等原因的话,这样：i need some monwy for the field trip,so im going to the bank after this.
美式的说法,中式英语才在school trip里用school