蒋英老师答中学生读者问

问一:There are many presents needed____(sort) out.空格中应该填sorting,还是be sorted或to be sorted？答:该句可以写成:There are many presents which/that are needed to be sorted out．为什么呢?need用做实意动词时,有两种用法。①当need以物做主语时,其后的动词如果和句中的主语是动宾关系,可接动名词或不定式的被动式,例如:The car needs repairing．(=The car needs to be repaired．)这辆汽车需要修理。②当need以人做主语时,可接动词不定式,例如:You don’t need to worry about him．你不必为他担心。你列举的句子“许多礼物需要分类”,可写成:Many presents need sorting out/to be sorted out．或Many presents are needed to be sorted out by sb．属于第二种用法的被动形式。need也可做情态动词,用法这里就不赘述了。