有读者问： should和ought to的区别如何？
should和ought to都意为“应该”，但前者的语气较为委婉，亦较为普通，常用以表一般性的忠告或意见，如：
(1)Carbon steel knives should be wiped clean after use.
(2)Crimes should be punished.
ought to的语气较强，常用以表示有针对性的意见，如：
(3)We ought to tidy up before we go home.
(4)She ought to see the doctor.
但ought to有时有“大概”的含义，如：
(5)He ought to be home by now.
