Call on or call for?

我們常常在英文報章雜誌上看到call on, 以及call for, 但常常會混淆用法. 我將這兩個短語動詞(phrasal verb)整理如下.

call on
1. 呼籲, 號召 : call on sb. to do sth.
   Ex. One of the leading churchmen has called on the government to resign...

2. 拜訪, 探訪
   Ex. I was intending to call on Mr. Lee last Monday.


call for
要求 : call for sth.
   Ex1. The ceasefire resolution calls for the release of all prisoners of war. 停火決議要求釋放所有戰俘。

   Ex2. It's a situation that calls for a blend of delicacy and force. 應付這種局面需要剛柔並濟。