判断下列语句是否用法真确When we walk across the road,we must look at the traffic lights if it changes to green.

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判断下列语句是否用法真确
When we walk across the road,we must look at the traffic lights if it changes to green.

if在这儿不能表达是否的意思,宾语从句中才可以,否则是如果的意思.这样句子意思就很奇怪了.

用法正确http://zhidao.baidu.com/question/243290620.html