區別是：
be absent from 後面往往跟地點名詞，表示在某地點缺勤或缺席。
be absent for 後面往往跟事物名詞，表示缺席某個事件。
例句辨析：
be absent from
1、I have a terrible headache and will be absent from the office today.
甲：我頭痛的很厲害，今天我不上班了。
2、You should not be absent from school without cause.
沒有理由，你不該缺席。
3、I can"t afford to be absent from school.
我不能不上學。
4、You must not be absent from the meetings without cause.
你必須叄加那些會議，不得無故缺席。
be absent for
1、They begin to sleep during the class or even be absent for classes.
上課睡覺，甚者曠課；沉迷於計算機遊戲，或者金庸小說。
2、Your mother tells me you have the mumps and must be absent for half a month.
你母親告訴我，你患腮腺炎，必須休假半個月。
3、He felt the Lakers were deflated following the news Bynum would be absent for eightweeks, not to mention their recent frequency of play.
他覺得湖人受到了拜納姆缺席八週訊息的影響，並沒有談到近來他們比賽的密度。
4、To be absent for consecutive three days without justifiable grounds or be absent for six days in a month.
無正常理由連續曠職三日或一個月內曠職達六日者。
區別是：
be absent from 後面往往跟地點名詞，表示在某地點缺勤或缺席。
be absent for 後面往往跟事物名詞，表示缺席某個事件。
例句辨析：
be absent from
1、I have a terrible headache and will be absent from the office today.
甲：我頭痛的很厲害，今天我不上班了。
2、You should not be absent from school without cause.
沒有理由，你不該缺席。
3、I can"t afford to be absent from school.
我不能不上學。
4、You must not be absent from the meetings without cause.
你必須叄加那些會議，不得無故缺席。
be absent for
1、They begin to sleep during the class or even be absent for classes.
上課睡覺，甚者曠課；沉迷於計算機遊戲，或者金庸小說。
2、Your mother tells me you have the mumps and must be absent for half a month.
你母親告訴我，你患腮腺炎，必須休假半個月。
3、He felt the Lakers were deflated following the news Bynum would be absent for eightweeks, not to mention their recent frequency of play.
他覺得湖人受到了拜納姆缺席八週訊息的影響，並沒有談到近來他們比賽的密度。
4、To be absent for consecutive three days without justifiable grounds or be absent for six days in a month.
無正常理由連續曠職三日或一個月內曠職達六日者。