past simple and past perfect exercises pdf with answers

... recently, don’t you think? 6 My grandfather died 30 years ago. I (never/meet) him. 4. Fill in the blanks with modals: must - have to - ought to - used to 1. You wash your hands before meals. 2. It’s ... bright red dress and long black stockings. Last year in another play, she had to wear short socks and a bright, orange-colored dress. If anyone asks her how old she is, she always answers, “My ... the party? 7. There are many clouds in the sky. It (rain) ….…… …………………………… 6. Read the passage and answer the following questions: My aunt Nhan is an actress. She must be at least thirty-five....

Ngày tải lên: 08/07/2013, 01:27

... TOPIC 2: OUR PAST PERIOD 8: PRESENT SIMPLE, PAST SIMPLE AND PREPOSITIONS OF TIME A. Theory: 1. Present simple and past simple: Tenses Affirmation Negation Interrogation Present simple S + am/ ... morning, Tuan and his father go jogging around Xuan Huong Lake. Hoa and her mother walked along Bui Thi Xuan Street and then visited the flower garden. Hoa liked it very much and the flowers ... ……………………………………………………………………………………………… ……………………………………………………………………………………………… ………………………….…………… V. Read the passage and answer question below: In the summer holidays, Mr. Hung, Mrs. Chi and their children, Tuan and Hoa often go to the beach for two or three...

Ngày tải lên: 09/07/2013, 01:26

... 10. B: I (be / not) to Australia yet. Simple Past or Present Perfect Simple Exercise 3 Put the verbs into the correct tense (simple past or present perfect simple) . 1. A: (you / be / ever) to London? ... (can / concentrate / not) on the film. Simple Past or Present Perfect Simple Exercise 8 Put the verbs into the correct tense (simple past or present perfect simple) . 1. I (just / finish) my homework. ... Sentences in Present Perfect Simple 1. Bob / visit / his grandma 2. Jimmy / play / on the computer 1 Questions Put the verbs into the correct tense (simple past or present perfect simple) . 1. (you...

Ngày tải lên: 15/09/2013, 00:10

... Past simple (Thì quá khứ đơn) Simple Past là thì quá khứ đơn. Để viết câu ở thì Simple Past ta chia động từ ở dạng past của nó. Hầu hết các động từ khi ... hold :held to meet :met to stand :stood to mean :meant to read /rid/ :read /red/ to sit :sat to take :took to think :thought * Chúng ta dùng thì Simple Past để chỉ một sự việc đã xảy ... herself It itself Số nhiều We ourselves You yourselves They themselves Ví dụ: Tom is shaving and he cuts himself. (không phải he cuts him) (Tom đang cạo râu và anh ta cắt phải mình). The...

Ngày tải lên: 19/01/2014, 17:20

... load and constant temperature gradient ∆T. 4 Modeling and Simulation of Thermoelectric Energy Harvesting Processes Piotr Dziurdzia AGH University of Science and Technology in Cracow Poland ... Peltier effect Q c1 and Q h1 , Joule heat Q c2 and Q h2 , heat conduction Q c3 and Q h3 . In case of the Joule heat it is assumed that one half of it dissipates at the cold side and the other half ... Sustainable Energy Harvesting Technologies – Past, Present and Future 116 resistive load R L , the voltage V S forces a Peltier current I flow, and in consequence there appears a Joule heat...

Ngày tải lên: 19/06/2014, 08:20

... Circuits and Systems, vol.2, no.4, pp.251-259, 2008. 168 Sustainable Energy Harvesting Technologies – Past, Present and Future 14 Sustainable Energy Harvesting Technologies: Past, Present and Future At ... Energy Harvesting Technologies – Past, Present and Future 10 Sustainable Energy Harvesting Technologies: Past, Present and Future 4. Hybrid flexible energy harvesting and energy storage The proposed ... – Past, Present and Future 2 Sustainable Energy Harvesting Technologies: Past, Present and Future μW. Indoor light intensity in office environment is in the range of < 10 W/m 2 , compare with...

Ngày tải lên: 19/06/2014, 08:20

... Technologies – Past, Present and Future 254 The transmitter consists of one-chip microcomputer (MCU) PIC16F877A and wireless module nRF24L01P for the control, and MCU can be connected with an outside ... data by the temperature sensor with WLAN at 2.4 GHz (ISM band). An ISM band sleeve antenna is used for the transmission. Using the cellular band rectenna shown and discussed in Section 2.5.1, ... http://www.secomtel.com/UpFilesPDF /PDF/ Agilent /PDF_ DOCS/SKYDIODE/ 03_ SKYDI/HSMS2850 .PDF (Last accessed on 13 July, 2011) [6] McSpadden, J. et al., H. (1992). Theoretical and Experimental Investigation...

Ngày tải lên: 19/06/2014, 08:20

... same time in the past. Eg. Mark was reading a book and Tony was watching television. BE CAREFUL!!!! The past continuous and the past simple are often used together. The past simple interrupts ... action of the past continuous. Eg. I was watching television when my friend arrived. BE CAREFUL!!!! The past continuous and the past simple are often used together. The past simple interrupts ... at the same time in the past. Eg. Mark was reading a book and Tony was watching television. We use the past continuous to talk about an action that started in the past but not finished at...

Ngày tải lên: 31/08/2013, 01:10

... and (ii) are treated in Sections 5 and 6, respectively. Sections 7 and 8 are devoted to step (iii). Sections 9 and 10 are concerned with Steps (iv) and (v). Section 11 deals with steps (vi) and ... the equation (6) with p =2,3,5are (n, y, p)=(1, 1,p) and (3, 2, 2). CLASSICAL AND MODULAR APPROACHES 1003 Lemma 12.2. Let K 0 , L and I be positive integers with K 0 ≥ 3, L ≥ 2 and I ≥ K 0 (K 0 +1)/2. ... for example [28] and [47]. We have however found it best to use a result of Landau. Lemma 9.1. Let K be a number field with degree d = r 1 +2r 2 where r 1 and r 2 are numbers of real and complex embeddings....

Ngày tải lên: 06/03/2014, 08:21

... has a lot of exams coming up soon, and he is also working on a term paper. He must have been studying at the library. Unit 5: Possibility and Probability Perfect Modals I. Possibility: May, ... room are turned off. She must be sleeping. (right now).  Past time: MODAL + have been + v-ing Meaning: in progress at a time in the past. ã Ex 1 : Sue wasn’t at home last night when we went ...  In negative sentences both must not and don’t have to (also don’t need to and need not) are used. Must not is used when the speaker expects or orders...

Ngày tải lên: 07/03/2014, 07:20

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Ngày tải lên: 08/08/2014, 10:22

Ngày tải lên: 08/08/2014, 13:22

Ngày tải lên: 14/08/2014, 15:22

Ngày tải lên: 31/08/2013, 01:10

... 4. The past continuous tense : ( thì quá khứ tiếp diễn ) _ Formation : ( công thức ) S + was / were +...

Ngày tải lên: 30/10/2013, 14:11

... been”) Vậy thì ai làm nhỉ.      Present perfect and past (2) Unit 14. Present perfect and past (2) A Chúng ta không dùng thì present perfect (I have done) khi nói về một thời điểm ... khứ ( present perfect và past simple) qua các câu sau: Present perfect (have done) I’ve done a lot of work today. Hôm nay tôi đã làm nhiều việc. Chúng ta dùng thì present perfect khi đề ... “have you done”). Bạn đã bị như thế nào? Past simple (did) I did a lot of work yesterday. Hôm qua tôi đã làm nhiều việc. Chúng ta dùng thì simple past khi đề cập tới một thời điểm đã kết thúc...

Ngày tải lên: 19/01/2014, 17:20

... straightforward and well-documented book provides strong direction and clear-cut answers for consumers, based on well-reasoned research and compelling evidence. His use of . . . superfruits criteria and ... entertaining and informative book. Dr. Gross is a leading expert and strong proponent of consumer education and superfruit sci- ence, and following careers as a university scientist, entrepreneur, and ... consumer educa- tion and superfruit science, and following careers as a university scientist, entrepreneur, and food industry consultant, he is the leading advocate for superfruits and superfruit...

Ngày tải lên: 06/03/2014, 05:21

... làm nhỉ. He lost his key (past simple) but now he has found it ( present perfect) . Anh ấy đã làm mất chìa khóa nhưng bây giờ anh ấy đã tìm ra. Thì present perfect là thì hiện tại hoàn ... sách). C Chúng ta dùng thì present perfect để đưa ra những thông tin mới (xem UNIT 7). Nhưng nếu chúng ta tiếp tục nói về điều đó, chúng ta dùng thì past simple: A: Ow! I’ve burnt myself. Ối! ... lost his key” = hiện giờ anh ấy không có chiếc chìa khóa của anh ấy. (xem UNIT 7). Còn thì past simple cho chúng ta biết về quá khứ. Nếu có ai đó nói rằng: “Tom lost his key” chúng ta không...

Ngày tải lên: 22/06/2014, 21:20