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.

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.
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.

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