请问it was worth saving two boys at the cost of three students' lives.这是什么句型,里面的it指什么原句是:they ask if it was worth saving two boys at the cost of three university students'lives.

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请问it was worth saving two boys at the cost of three students' lives.这是什么句型,里面的it指什么
原句是:they ask if it was worth saving two boys at the cost of three university students'lives.

it代指后面的saving two boys at the cost of three university students' lives.
意思是:(他们问)以三个大学生的生命为代价去挽救两个男孩,(它)值得吗?

如果从原句的角度讲,这一句是由if引导的宾语从句;
单讲这一句是一个主语从句,完整的是it was worth(that) saving two boys at the cost of three students' lives。此时it是形式主语,代替后面that引导的真正主语saving two boys at the cost of three university students...

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如果从原句的角度讲,这一句是由if引导的宾语从句;
单讲这一句是一个主语从句,完整的是it was worth(that) saving two boys at the cost of three students' lives。此时it是形式主语,代替后面that引导的真正主语saving two boys at the cost of three university students'lives.
原句意思是:他们问牺牲三个大学生的生命去挽救两个男孩是否值得?
单句意思是:牺牲三个大学生的生命去挽救两个男孩是否值得的。

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形式主语,指代后面的真主saving two boys at the cost of three university students'lives。
因为真主太长,所以用it代替,实现句子前后的平衡。