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how many gorillas would there have to be in order for the sp

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how many gorillas would there have to be in order for the species to be considered safe
中的两个to be是什么语法结构,
how many gorillas would there have to be in order for the sp
1.第一个to be.由于使用了动词have,句型there is 就变成了there have to be.
2.第二个to be.是句型for sb.to do sth.如:It is necessary for us to learn English well.只不过你句子中的to do 用了它的被动形式to be done.
翻译:必须有多少大猩猩才能确保这种生物被认为不会绝种(是安全的).