病句：They have less living areas.
分析：area为可数名词，表示“更少”应该用fewer，less表示“更少”只用于修饰不可数名词。
改正：They have fewer living areas.
病句：I think tiger is beautiful. / Tiger is the king of animals. / The tigers are big and strong.
分析：表示“种类”有三种形式：a+单数名词；the+单数名词；复数名词。
改正：I think the tiger is beautiful. / The tiger is the king of animals. / Tigers are big and strong.
病句：Their food are small animals.
分析：food 为不可数名词。
改正：Their food is small animals.
病句：We should do following actions.
分析：“采取措施”为take action，如果动词为do，则说do something。
改正：We should take the following actions.
病句：The number of tigers is getting smaller and smaller because the loss of their living areas.
分析：because +从句；because of+名词或名词性短语。
改正：The number of tigers is getting smaller and smaller because of the loss of their living areas.
病句：We should write letter to magazines.
分析：letter为可数名词，要加冠词a或用复数形式。
改正：We should write letters to magazines.
病句：There will have no tigers in the world soon.
分析：There be结构中不能出现have。
改正：There will be no tigers in the world soon.
病句：Their fur are beautiful.
分析：fur作为“(动物)皮毛”为不可数名词；作为“皮毛制品”为可数名词。
改正：Their fur is beautiful.
病句：We should build more reserves, don’t buy clothes made of animal fur.
分析：两个句子之间没有连词连接。
改正：We should build more reserves and don’t buy clothes made of animal fur.
病句：Tigers are big and strong. It has bright eyes.
分析：it不能指代复数名词tigers。
改正：Tigers are big and strong. They have bright eyes.
病句：They can run very fast and good at hunting other animals.
分析：good at 前缺少be，and前面没有be，故此处不能省略。
改正：They can run very fast and are good at hunting other animals.
病句：Tigers are usually live alone.
分析：live为动词，前面不能加are。
改正：Tigers usually live alone.
病句：We should take action to encourage people don’t buy things made of tiger fur.
分析：encourage sb not to do sth表示“鼓励/劝说某人不要做某事”。
改正：We should take action to encourage people not to buy things made of tiger fur.
病句：We should tell hunters don’t kill tigers any more.
分析：tell sb not to do sth表示“告诉某人不要做某事”。
改正：We should tell hunters not to kill tigers any more.
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