i think it dangerous to climb the hill.to climb the the hill

to climb the hill既不间接宾语也不是宾语补足语而是宾语
1.在这个结构中it 是形式宾语真正的宾语是to climb the hill
2.在英语句式中在think/consider/find/make/feel等词之后一般使用形式宾语it来代替真正的宾语而 把真正的宾语放在后面
结构为：主语+think/consider/find/make/feel+it+that或to do sth
eg:we make it a rule that all the students should wear uniforms
i feel it important to learn english well
在上句中that all the students should wear uniforms和to learn english well 都是 宾语