词类：代词：1．both, either 和neitherboth:  二者都(复数)          Both of the boys are clever.neither：二者都不（单数）     Neither of the boys is clever. either： 二者中任何一个（单数）  Either of the boys is clever.   Both problems are not difficult. 2. other, another, the other, others, the othersanother: 泛指众多中另一个， 又一个，     I have finished the novel. Please give me another (one)     Would you like another (cup of tea)?     They will stay in Beijing for another two days.other： 其它， the other：二者中另一个，用于 “one… the other…” 词组中      ...