有一读者问： 我认为 if you should go to town 要比 if you go to town 委婉客气，但不知它与 should you go to town 相比时，是否二者同样委婉，只不过后者较为文气而已？
据一位英语语法家说， should you see him 要比 if you should see him 更为委婉。他将下列7种说法根据委婉程度的递增次序排列如下：
(1)If you see him
(2)If you should see him
(3)Should you see him
(4)If you happen to see him
(5)If you should happen to see him
(6)Should you happen to see him
(7)Should you by any chance happen to see him
顺便说一下，上述7种说法之所以一个比一个委婉客气，完全是由于其可能性一个比一个小的缘故。
