English Grammar in Use 笔记
Present continuous (I am doing)
Present simple (I do)
Past simple (I did)
Past continuous (I was doing)
Present perfect (simple) (I have done)
Present perfect continuous (I have been doing)
Present continuous (I am doing)
Present simple (I do)
Past simple (I did)
Past continuous (I was doing)
Present perfect (simple) (I have done)
Present perfect continuous (I have been doing)