有一读者问： 有这样一道选择题：
(1)The door opens_________itself. It _____.
A. by; will be colsed B. for; will open
C. of; won't shut D. on; won't open
为何答案是C? itself 之前为何用 of?
选C是因为只有它符合题意。 of itself 是一习惯说法，其义是“自动地”，再如：
(2)The fire went out of itself .
(3)Inertia means that a body cannot of itself change its state of rest or motion.
won't shut 是“关不上”的意思。 won't 表示“拒绝，就是不”。
(4)The car won't start . 这车发动不了。
(5)This mark won't come off .这个污点去不掉。
(6)There are none so deaf as those who won't hear .
最聋的人是那些充耳不闻的人。
