Tài liệu ngữ pháp tiếng anh tham khảo - Present Perfect- since and for | Present Perfect: Since and For Bill Gates and Microsoft 6 Who Is Bill Gates? Bill Gates is one of the richest and most successful business executives in the world. Millions of people have used his computer programs for the past three decades. Bill Gates has always loved working with computers. In fact, he has programmed computers since his early teens. He has been the CEO of Microsoft Corporation since 1975. Since then, Bill Gates has written several books and has given billions of dollars to schools. For the last several years, he and his wife Melinda have donated a substanial amount of money to organizations working in global health. Form 1 The present perfect is formed with: Bill Gates has been the CEO since 1975. Many people have used Microsoft’s programs. + form of have past participle Form 2 Past participles can be regular or irregular. Gates has always loved working with computers. The regular form of the past participle is base form of verb + -d or -ed. Gates has been the CEO since 1975. He and his wife have given lots of money to schools. Form 3 There are many irregular past participles. Past participles can be regular or irregular. Form 4 Note these common irregular past participles. write – written give – given be – been see – seen read – read do – done Bill Gates has been CEO of Microsoft since 1975. Present Perfect Use the present perfect to talk about something that began in the past and continues into the present (and may continue into the future). future 1975 past now since 1975. has been CEO Bill Gates has written several books since 1975. Using Since 1 Use the present perfect with since + point in time to show when something started. future 1975 past now since 1975. has written several books Gates has programmed computers since he was 13 years old. Using Since 2 Since can also introduce a time clause. future age 13 past now since he was 13 years old. has programmed computers time clause Change the sentences to present perfect. Add the since . | Present Perfect: Since and For Bill Gates and Microsoft 6 Who Is Bill Gates? Bill Gates is one of the richest and most successful business executives in the world. Millions of people have used his computer programs for the past three decades. Bill Gates has always loved working with computers. In fact, he has programmed computers since his early teens. He has been the CEO of Microsoft Corporation since 1975. Since then, Bill Gates has written several books and has given billions of dollars to schools. For the last several years, he and his wife Melinda have donated a substanial amount of money to organizations working in global health. Form 1 The present perfect is formed with: Bill Gates has been the CEO since 1975. Many people have used Microsoft’s programs. + form of have past participle Form 2 Past participles can be regular or irregular. Gates has always loved working with computers. The regular form of the past participle is base form of verb + -d or -ed. Gates has been the .
