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?

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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?

to survive falls修饰主语ability
谓语is