The white kitten had been unable to do anything for the last quarter of an hourThe white kitten had been unable看成主系表,to do anything作目的状语,for后面时间状语?这样可以吗?主系表+to do. to do 一般都系目的状语吗?
We are also doing the same with other vital resources not usually thought of asbeing nonrenewable such as fertile soils, groundwater and the millions of otherspecies that share the earth with us.本句中not部分是并列句还是并列表语呢?thought在这里应该是名词吧?
语法填空题:All these years these
talented writers __________ (contribute) articles to our magazines.这里答案给的是have been
contributing.这是唯一答案吗?为什么要填完成进行时态不能填过去时或者现在完成时?