Thì hiện tại hoàn thành với Since và For. a.Công thức Has/have +PII b.Cách chia (+) I(We,you,they )Have worked for three years. He (she,it) has worked for three years. (-)I(We,you,they )have not worked for three years. He (she,it) has not worked for three years. Note :have not=havent Has not= hasnt (?) Have I(We,you,they ) worked for three years.? Has he (she,it) worked for three years? Cách dùng:Thì hiện tại hoàn thành diễn tả mọt hành động bắt đầu trong quá khứ ,còn tiếp tục đến hiện tại và chua hoàn thành ở hiện tại .Thì này thờng dễ đ- ợc nhận thấy qua cách dùng của các trạng từ chỉ thời gian for và since. Eg:They have learned English for 3 years. (Họ học tiếng anh đợc ba năm rồi( bây giờ vẫn học). He has lived here since 2003 (anh ấy sống ở đây từ năm 2003 (bây giờ vẫn sống) -Thì hiện tại hoàn thành đợc dùng để diễn tả một hành độngvừa mới xảy ra .Trong trờng hợp này thờng có chữ just đặt giữa Have và PII. Eg: I have just come (Tôi vừa mới đến) Present perfect with for & since o For + ( a period of time ) For 10 years For 23 seconds o Since + ( a point of time ) Since Monday Since 1989 I have studied English for 10 years. She has not seen Lan since 1989. II.Exercises VI.Cho d ng ỳng c a ng t trong ngo c: 1. Would you like (listen) to some music? 2. Yesterday, Ba ( go) .to Danang by car. 3. Nam enjoys ( play) soccer after school. 4. Lan asked me (go) .to the supermarket. 5. Mai is (buy) .a new bicycle next week. 6. I think you should (do) .the morning exercise. 7. They used (go) to work by train. 8. Don’t let children (play) .alone. 9. You ought to (do) the homework yourself. 10.My father stopped (smoke) 11.Mai has enough money (buy) a new bicycle. 12.Hoa often (do) .the homework after school. 13.Look! A baby (cross) .the road. 14.I need (buy) some notebook. 15.My teacher said I should (spend) .more time on my English. 16.Mr Hung told me (tell) him the truth. 17.Nga likes ( play) badminton. 18.They asked their children ( stay) at home. 19.Nam must (do) the homework himself. 20.My mother ( buy) a house last week. 21.I’d like (buy) .some eggs. 1. Jack (be) unemployed since April. 2. My sister (study) languages at university for two years. 3. How long (you / know) Tom? 4. Where (you / be)? I (be) to the dentist. 5. (you / ever / see) a fire? 6. I (not / finish) my letter yet. 7. Daniel Steel is a famous novelist. She (write) a lot of novels. 8. Here are your shoes, I (just / clean) them. 9. His hair is very short. He (have) a haircut. 10.Mary (not / drink) any coffee sofar today. . for & since o For + ( a period of time ) For 10 years For 23 seconds o Since + ( a point of time ) Since Monday Since 1989 I have studied English for. chỉ thời gian for và since. Eg:They have learned English for 3 years. (Họ học tiếng anh đợc ba năm rồi( bây giờ vẫn học). He has lived here since 2003 (anh