do的用法:1) 构成一般疑问句,例如:Do you want to pass the CET? 你想通过大学英语测试吗?Did you study German? 你们学过德语吗?2) do + not 构成否定句,例如:I do not want to be criticized.我不想挨批评。He doesn't like to study.他不想学习。In the past, many students did not know the importance of English. 过去,好多学生不知道英语的重要性。3) 构成否定祈使句,例如: Don't go there...