什么情况下动词要变为第三人称单数?答:情况:1.主语是第三人称单数 2.主语是不可数名词或可数名词单数 3.代词为everything,everybody,everyone,none,nothing,nobody,anybody,anyone,anything等时,如:Nobody knows the answer.4.名词前有every,each,no,either of,neither of,none of等时,如:Neither of us likes running.这些东西还是问...