present perfect vs past exercises pdf
Tài liệu Present perfect and past doc
Ngày tải lên :
19/01/2014, 17:20
... 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....
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EXESRCISES ON PAST SIMPLE OR PRESENT PERFECT
Ngày tải lên :
15/09/2013, 00:10
... 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....
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Sustainable Energy Harvesting Technologies Past Present and Future Part 7 pdf
Ngày tải lên :
19/06/2014, 08:20
... Energy Harvesting Technologies – Past, Present and Future
120
(
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23
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TTQR R R=+ + +
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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...
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Sustainable Energy Harvesting Technologies Past Present and Future Part 9 pdf
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
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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...
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Sustainable Energy Harvesting Technologies Past Present and Future Part 14 pdf
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
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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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grammar-present perfect
Ngày tải lên :
30/06/2013, 01:27
... 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...
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TChon 14 PRESENT PERFECT WITH SINCE AND FOR.doc
Ngày tải lên :
08/07/2013, 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)...
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present perfect - lí thuyết cb
Ngày tải lên :
20/07/2013, 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...
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