高考英语专项 语法 时态 7 现在完成时 讲解+练习+答案 present perfect

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Present Perfect Tense
现在完成时
主谓模块 1：I have been
我已经是...(结果)/我已经是...有一段时间了（“可延续性”）
肯定句 否定句 一般疑问句及回答
I have been a worker. I have not been a worker. Have you been a worker
Yes, I have. / No, I haven’t.
You have been a worker. You have not been a worker. Have you been a worker
Yes, I have. / No, I ha...