问题 could have done 和 could do 辨析区分？

...arrassment. I wondered what a stranger would have taken him to be, sitting there in his old Norfolk jacket and his unbrushed bowler; his trousers were baggy, his hands were not clean; and his face, with the red stubble of the unshaved chin, the little eyes, and the large, aggressive nose, was uncout...

话题 as...as could be

话题 for as long as

话题 only as good as

话题 for as long as

话题 as soon as possible

话题 would as soon...as...

话题 关于as…as…的句子分析

话题 as much as that

话题 as...as结构的语义理解

话题 as many as放句首

话题 as much as的用法

话题 as long as的疑惑

话题 as as sb can

话题 as often as not