2.助动词have/has/had+过去分词形式,构成完成时。 We have studied English for five years.我们学英语已经五年了。 Have you seen Li Hua?你见到李华了吗? We have read English for an hour.我们读了一小时英语了。 3.助动词do/does/did用于构成疑问句和否定句,用于...