1.of和for有区别吗?(加例子) 2.Is she your sister?与Is it you

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一.在不同词条里区别是不同的,但of通常指人的品质或是名词所有格中指无生命的部分；而for常译为“为了”表示原因或者目的.
of:prep.…的,表示所属
例句与用法:
1.Many of the students came from other countries.
学生中许多人来自其他国家.
2.I have heard of him.
我听说过他.
3.He is the best of teachers.
他是最好的老师.
4.I've never heard of such places.
我从未听说过这些地方.
5.My phone was out of order.
我的电话坏了.
6.Joan of Arc was made a saint in 1920.
1920年,贞德被追封为圣女.
7.I'm under a lot of pressure.
我的压力很大.
for:conj.因为
prep.给,为
例句与用法:
1.He shook his head,for he thought differently.
他摇摇头,因为他的想法与此不同.
2.Are you for or against?
你是赞成还是反对?
3.What can I do for you?
我能帮你什么忙吗?
4.He has a great respect for his father.
他很敬佩他的父亲.
5.It is for her own good.
这是为了对她自己有好处.
6.Jim is going to get material for a new book.
吉姆正打算为一部新书准备材料.
7.They jumped for joy.
他们高兴地跳了起来.
8.We have studied English for years.
我们学英语已有好几年了.
二.Is she your sister?回答是Yes,she is./No,she isn't.
三.Is it your pen?的回答,是Yes,it is./No,it isn't.
四.Is she your sister?和Is it your pen?问的对象不同,所以回答当然也不同,
Is she your sister?问的是人,要用人来回答（she,he,we,I）
Is it your pen?问的是物品（your pen）,要用物来回答（it,they）