1、she is so angry that her kitty spilted the milk on the table.
2、Lily was so sad that her boyfriend broke up with her yesterday.
3、The door is so small that the fatty boy cannot walk into.
4、who`s that?或者That is my picture.
5、Is that your book?
6、I want you to meet my friends,that one whose wear a hat is Paul, and the other one is Peter.
(错)The tree, that is four hundred years old, Is very famous here.
We depend on the land from which we get our food.
We depend on the land that/which we get our food from.
(1) 在there be 句型中，只用that，不用which。
(2) 在不定代词，如：anything, nothing, the one, all等作先行词时，只用that，不用which。
(3) 先行词有the only, the very,the same,the last,just修饰时，只用that。
(8) 先行词是the way或the reason时，that可作关系副词，也可省略
(9) 主句的主语是疑问词who /which时