...what to do结构是 what 引导的名词从句的省略,所以 what to do可以还原成相对应的名词从句,主语是已经在主句中出现的主语。而what to be done则不然,因为what 就是主语,所以不能还原。那么I don't know what I will be told?这个句子,...
...fertilises the desert soil. 粪便含氮,而正是氮可以肥化荒芜的土地。it指nitrogen,那么that 是否是指示代词?The United States will do that which is necessary to meet its obligations ...