present perfect vs past exercises pdf

Ngày tải lên: 08/08/2014, 13:22

Ngày tải lên: 08/07/2013, 01:27

... has 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 ... quá 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 ... viết 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....

Ngày tải lên: 19/01/2014, 17:20

Ngày tải lên: 22/06/2014, 21:20

Ngày tải lên: 08/08/2014, 10:22

... but we (have / not) time to talk then. Simple Past or Present Perfect Simple Exercise 2 Put the verbs into the correct tense (simple past or present perfect simple). 1. A: I (cycle / just) 50 km. ... 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 ... Sentences Put the verbs into the correct tense (simple past or present perfect simple). 10 Put the verbs into the correct tense (simple past or present perfect simple). 1. He (leave / just) his house....

Ngày tải lên: 15/09/2013, 00:10

... Energy Harvesting Technologies – Past, Present and Future 120 ( ) 23 __ _ca cthhsthAlO thCu TTQR R R=+ + + (19) R th_hs is the thermal resistance represented by a heat sink and it takes ... Harvesting Technologies – Past, Present and Future 110 about tens of mV resulting from very small temperature gradients, equaling to single Celsius degrees. In fact, some presented prototypes ... 0 0 0 0 0 1 -1 Electrothermal Macromodel of TEG TH TA TC VS Sustainable Energy Harvesting Technologies – Past, Present and Future 112 The most commonly used thermocouples in...

Ngày tải lên: 19/06/2014, 08:20

... pp.251-259, 2008. 168 Sustainable Energy Harvesting Technologies – Past, Present and Future 14 Sustainable Energy Harvesting Technologies: Past, Present and Future At 400 lux, the maximum power that the ... aqueous 156 Sustainable Energy Harvesting Technologies – Past, Present and Future 12 Sustainable Energy Harvesting Technologies: Past, Present and Future Fig. 13. Voltage across PV panel Fig. ... W/m 2 . 162 Sustainable Energy Harvesting Technologies – Past, Present and Future 10 Sustainable Energy Harvesting Technologies: Past, Present and Future 4. Hybrid flexible energy harvesting and...

Ngày tải lên: 19/06/2014, 08:20

... 101-106, Kyoto, Japan, March, 2010 [5] 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). ... Ctmr = 820 pF Vsn, Ctmr = 520 pF Vsn, Ctmr = 820 pF Vout, Ctmr = 520 pF Vout, Ctmr = 820 pF 11.21.41.61.82 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 Fosc (Gate Signal) Vsn (Switching signal) ... rectenna circuit. This has the benefit of ensuring Sustainable Energy Harvesting Technologies – Past, Present and Future 256 The voltage of the capacitor decreases to 2V when 3.2mW is consumed...

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Ngày tải lên: 05/05/2015, 16:00

... to school? 3- How long the road (be)? 4- How long they (teach) here? VIII-Grammar in use. A -Present perfect. 1-Structure Have Ved/PII(QKPT) *Ved work -> worked *PII do ->did ->done 2-Usages a-have...

Ngày tải lên: 30/06/2013, 01:27

... Topic4: MY NEIGHBORHOOD PERIOD 14. PRESENT PERFECT WITH SINCE AND FOR A. Revision: The Present Perfect Tense 1. Form - Affirmative: S + has/have +V3/ed…. - ... very dirty. We haven't cleaned it …………… ages. II. Put the verbs in parentheses into the present perfect tense: 1 He (practice)_______________ the piano Since 8 o'clock. 2 I (not meet)...

Ngày tải lên: 08/07/2013, 01:27

... supermarket. Present Perfect - Use The Present Perfect is not easy to understand for ESL learners. It is a combination of past and present. An actions in the past has something to do with the present. 1) ... now recently since for Signal Words of Present Perfect  already, ever, just, never, not yet, so far, till now, up to now Form of the Present Perfect We form the Present Perfect with have and the past participle ... (has) with affirmative or negative sentences. Present Perfect - Spelling You have to know all forms of the irregular verbs very well. For the Present Perfect you need the form of the verb which...

Ngày tải lên: 20/07/2013, 01:27