A cat is ability to survive falls is based on fact.falls是复数为啥用is?

A cat's ability to survive falls is based on fact.可以改成A cat's ability of surviving falls is ba可以改成A cat's ability of surviving falls is based on fact. A cat's ability to survive falls is based on fact.的falls是名词吗? A cat's ability to survive falls is based on fact.为什么用复数falls? A cat is ability to survive falls is based on fact.falls是复数为啥用is? a cat's ability to survive falls is based on fact为什么fact不用复数facts形式? 新概念三册第9课 A cat's ability to survive falls is based on fact 这句话中我不明白ability to survive falls .be既然做动词了,那ability to survive 不是含有动词的吗? A cat’s ability to survive falls is based on fact.分析一下主谓宾我觉得to survive falls 是做后置定语修饰A cat’s ability ,不过为什么survive 后面不加from? a cat's ability to survive falls is based on fact.句型分析a cat's ability to survive falls is based on fact.句型分析?1.请问这句句子survive falls分别是什么词性,在句子中作什么成分,拯救下跌,survive 是动词,falls 是 a cat's ability to survive falls is based on fact 请问to survive falls是一个词组还是什么,怎么去科学理解,或这是什么语法现象 there is a cat there is more than ane way to skin a cat A cat is looking for something to eat.改为过去式 Last cat to reach the dead tree is a mouse. 英语：My ability to write and speak English is a good standardMy ability to write and speak English is a good standard这句话有问题没 It is true that one need to read a lot to improve his reading ability. the ability of the directions is to provide a complete guide to the university It is easy for him to increase his ability () read.A for B to He is understood to be a man of ability.句子中不定式作什么成份.