EX13. Chọn câu có cùng ý nghĩa với câu cho sẵn. 1. The last time I ate sushi was the last summer. A. I have eaten sushi since the last summer. B. I haven’t eaten sushi since the last summer. 2. I last saw her on Monday. A. I haven’t seen her since Monday. B. I have seen her since Monday. 3. I haven’t watered this tree for a week. A. The last time I watered this tree was a week ago. B. The last time I didn’t water this tree was a week ago. 4. I started collecting stamps last winter. A. I have collected stamps since last summer. B. I have started collecting stamps since last summer. 5. How long have you worked as a volunteer? A. When did you start working as a volunteer? B. When have you worked as a volunteer? 6. This singer’s last performance was in Jly 20th. A. This singer has performed since July 20th. B. This singer hasn’t performed since July 20th. 7. They began playing tennis in the spring of 2012. A. They have played tennis since the spring of 2012. B. They haven’t played tennis since the spring of 2012. 8. I last went to the zoo when I was 10. A. I haven’t gone to the zoo since I was 10. B. I have gone to the zoo since I was 10.

Mục đích của việc áp dụng các biện pháp kỹ thuật trồng trọt Vote5* + CTLHN NOT COPPY THANKS

Theo các nhà triết học đây thì hình này có nghĩa là gì? Nhờ các cao nhân giải thích hộ.

...............................

EX14. Chuyển các câu sau từ thì quá khứ đơn sang thì hiện tại hoàn thành sao cho nghĩa của câu không thay đổi. 1. The last time I played the violin was 2 years ago. => ____________________________________________________________________. 2. The last time the team won the prize was a long time ago. => ____________________________________________________________________. 3. She last did charity work 2 years ago. => ____________________________________________________________________. 4. The last time I wrote a letter was 5 years ago. => ____________________________________________________________________. 5. My father stopped smoking in 2014. => ____________________________________________________________________. 6. I last donated my blood 7 months ago. => ____________________________________________________________________. 7. When did you start doing charitable work? => ____________________________________________________________________. 8. The last time she involved in community service was 2 months ago. => ____________________________________________________________________. 9. She said: “I began working as an activist when I was 20 years old.” => ____________________________________________________________________. 10. My best friend gave up eating fast food last year. => ____________________________________________________________________.

Cho tam giác ABC vuông tại A, vẽ đường cao AH. Chu vi của tam giác ABH là 30 cm và chu vi tam giác ACH là 40cm. Tính chu vi của tam giác ABC ( không nhìn mạng!!!!)

Mn có thể vt ra tập r ghi kèm tóm tắt để em bt được cách làm k ạ lm đơn giản 1 chút để bt ạ hihi mong mn giúp để e tặng 5 sao ạ

EX15. Chuyển các câu sau từ thì hiện tại hoàn thành sang thì quá khứ đơn sao cho nghĩa của câu không thay đổi. 1. We have learned English for 10 years. => ____________________________________________________________________. 2. It has been a long time since we last met. => ____________________________________________________________________. 3. Ms. Ann hasn’t taken part in any voluntary programs for 4 years. => ____________________________________________________________________. 4. I haven’t mer my family since last Christmas. => ____________________________________________________________________. 5. How long have you lived here? => __________________________________________________________________ 6. The volunteers have provided free food and fresh water to homeless people since yesterday. => ____________________________________________________________________. 7. The doctor has quitted his job in the local hospital and moved to the central hospital for 2 days. => ____________________________________________________________________. 8. The children haven’t had a long vacation since last year. => ____________________________________________________________________. 9. They haven’t visited their parents for 3 months. => ____________________________________________________________________. 10. It has been 2 years since we broke up. => ____________________________________________________________________.

Kí hiệu không có đáp án trong toán học là kí hiệu nào ạ?

EX16. Chia động từ trong ngoặc về thì quá khứ đơn hoặc hiện tại hoàn thành (thể khẳng định hoặc phủ định) sao cho phù hợp. 1. Last month our class (go) ____________ on a field trip with our teacher. We (not have) ____________ another field trip since then. 2. I (use to/ live) ____________ with my grandmother until I (be) ____________ 18. Since then, I (meet) ____________ my grandmother again. 3. My mother (work) ____________ as a teacher in the local high school for 20 years before her retirement. 4. The last time we (have) ____________ dinner together was 2 weeks ago. 5. My uncle (meet) ____________ his family since he (go) ____________ on a business trip last month. 6. Your friend Sarah (just/ phone) ____________ you. She (say) ____________ sorry because she (can/ come) ____________ to your party. 7. So far, I (already/ read) ____________ 11 different books. My most favourite book is “Paper towns” by John Green. I (finish) ____________ reading it last weekend. 8. Last night I (feel) ____________ well, so my father (take) ____________ me to hospital. I (be) ____________ out of hospital yet.