分析句子成分When wei cross the street, we must pay attention to the light.

1.When we cross the street,状语从句we must pay attention to the light.主句2.状语从句中的成分：When连接词we 主语cross谓语the street,宾语3.主句中的成分：we 主语must pay attention to 谓语the light.宾语...