when能否与完成时使用,是否因when在当(即条件状语从句)和何时(即简单句)意思时使用情况不同? 书中when在条件状语从句主句和从句中举例: 1.When you have got enough points,a cloud will come down and carry you off to a place you have never visited before. 2.The film had been on for ten minutes when we entered the cinema. 书中使用是否正确?那在简单句中呢?