[BEGINNING OF INTERACTIVE PRESENTATION (Screens 4-16)] Screen 4. Screens 4-16 are part of Interactive chart to follow the static charts (Screens 1-3). Notes: Set “Unit 8. Present Perfect: Since and For” at top left of screen. Increase size of “Bill Gates and Microsoft” and keep photo. See design notes. Cut all other text.

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 substantial amount of money to organizations working in global health. Screen 5

+ Form 1 form of have past participle The present perfect is formed with: form of have + past participle Screen 6 Bill Gates has been the CEO since 1975. Many people have used Microsoft’s programs.

Form 2 Past participles can be regular or irregular. The regular form of the past participle is base form of verb + -d or -ed. Screen 7 Gates has always loved working with computers.

irregular past participles. Form 3 Past participles can be regular or irregular. There are many irregular past participles. Screen 8 Gates has been the CEO since 1975. He and his wife have given lots of money to schools.

Form 4 Note these common irregular past participles. write – written give – given be – been see – seen read – read do – done Screen 9

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). Bill Gates has been CEO of Microsoft since 1975. since 1975. now past Screen 10 future has been CEO 1975

has written several books Using Since 1 Use the present perfect with since + point in time to show when something started. Bill Gates has written several books since 1975. since 1975. now Screen 11 past future has written several books 1975

Using Since 2 Since can also introduce a time clause. time clause Gates has programmed computers since he was 13 years old. since he was 13 years old. now Screen 12 past future has programmed computers age 13

Practice 1 Maria was in the garden yesterday. (since 9 a.m.) Change the sentences to present perfect. Add the since phrase in parentheses and delete any past tense time phrases. Practice 1 Example: Maria was in the garden yesterday. (since 9 a.m.) Maria has been in the garden since 9 a.m. 1. Bill Gates wrote many e-mails yesterday. (since 1975) Bill Gates has written many e-mails since 1975. 2. They gave a lot of books to schools last year. (since 1990) They have given a lot of books to schools since 1990. Screen 13 3. I saw many friends last weekend. (since I came home) I have seen many friends since I came home. 4. My sister read many articles last night. (since last August) My sister has read many articles since last August. 5. My friend worked at a pizza place a year ago. (since 2003) My friend has worked at a pizza place since 2003.

for the last three decades. Using For Use for + length of time to show how long something has lasted. Millions of people have used Gates’s software for the last three decades. for the last three decades. now Screen 14 for three decades past future have used Gates’s software

Since and For five o’clock ten minutes yesterday two days last summer Note the difference between since and for . since + point in time for + length of time five o’clock yesterday last summer 1996 he was a child ten minutes two days three decades many years a long time Screen 15

Practice 2 Complete the sentences with since or for. Example: Bill Gates has been married to Melinda French Gates ___________ 1994. since 1. Computers have been used in schools __________ more than a decade. for 2. I have had a computer in my office __________ the mid-1990s. since Screen 16 3. Many students have worked with computers __________ many years. for 4. My computer hasn’t given me any problems __________ last year. since