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The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The diagram below shows how electricity is generated in a hydroelectric power station. X5j8

A hydroelectric power station can generate electric power by using the energy of water flowing from high level to low level. It works different functions in day and night. In the day time, water in the high-level reservoir go through the intake under the dam which is only open in day time. Then the water flow into the power station in which there is a generator The generator is operated by a reversible turbines that can transfer the water flowing force to the mechanical force which is the power of the generator. The generated electricity then goes to the national grid through the power lines. On the other hand in the night time, the power station works in a reversed way. It pumps water from the low-level reservoir to high-level reservoir to provide the enough water for day time's work. The water is pumped by the same reversible turbines from low-level reservoir. So the power station actually consumes energy at night. But that is in order to generate more power in the day time. In a conclusion, a hydroelectric power station can generate power is based on the differce heighth of water level. In day time, it uses the natural water energy. Meanwhile in the night, it transfers the water to create and store the energy for the next day. Here is the examiner's comment: The answer covers the key features of the process and provides an overview of this process in the final paragraph. The detail is not always clear, but the key features are adequately highlighted. Information is arranged coherently and there is a clear overall progression. Cohesive devices are used to signal different stages of the process [Then | On the other hand | So In a conclusion | Meanwhile], and there is some use of pronouns for reference [It | which | that]. The range of vocabulary is adequate for the task [energy | operated by | transfer | mechanical], in spite of some errors in word form [a reversed way] and spelling [differce heighth]. There is a mix of simple and complex sentence forms and grammatical control is generally adequate, though there are some errors in the use of articles.

A hydroelectric You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
You use this word too often, consider replacing it withterminalhousedepotsitelocation
station
 can generate electric You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
 by using the You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy
 of You use this word too often, consider replacing it withdrinkrain
water
 flowing from high level to low level. It works This phrase/word is too simple and can be replaced with:various
different
 functions in day and night.

In the day You use this word too often, consider replacing it withpointgenerationpastsecondturnspace
time
, You use this word too often, consider replacing it withdrinkrain
water
 in the high-level You use this word too often, consider replacing it withtanksupplystockpilestoragelakesource
reservoir
 go through the intake under the dam which is This phrase/word (depending on the context) can be potentially replaced with :exclusively
only
 open in day You use this word too often, consider replacing it withpointgenerationpastsecondturnspace
time
. Then the You use this word too often, consider replacing it withdrinkrain
water
 flow into the You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
You use this word too often, consider replacing it withterminalhousedepotsitelocation
station
 in which there is a generator The generator is operated
 by a reversible Don't use indefinite articles with plural words. Did you mean "turbine"?turbine
turbines
 that can transfer the You use this word too often, consider replacing it withdrinkrain
water
 flowing force to the mechanical force which is the You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
 of the generator. The generated electricity then goes to the national grid through the You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
 lines.

On the other hand
 in the night You use this word too often, consider replacing it withpointgenerationpastsecondturnspace
time
, the You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
You use this word too often, consider replacing it withterminalhousedepotsitelocation
station
 works Consider replacing "in a reversed way" with the adverb for "reversed"; e.g., "in a hasty manner" with "hastily".
in a reversed way
. It pumps You use this word too often, consider replacing it withdrinkrain
water
 from the low-level You use this word too often, consider replacing it withtanksupplystockpilestoragelakesource
reservoir
 to high-level You use this word too often, consider replacing it withtanksupplystockpilestoragelakesource
reservoir
 to provide the This phrase/word is too simple and can be replaced with:abundance
enough
You use this word too often, consider replacing it withdrinkrain
water
 for day time's work. The You use this word too often, consider replacing it withdrinkrain
water
is pumped
 by the same reversible turbines from low-level You use this word too often, consider replacing it withtanksupplystockpilestoragelakesource
reservoir
. This phrase/word is too simple and can be replaced with:consequently
So
 the You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
You use this word too often, consider replacing it withterminalhousedepotsitelocation
station
 actually consumes You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy
 at night. This phrase/word is too simple and can be replaced with:on the contrary
But
that is
 in order to generate more You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
 in the day time.

In a conclusion, a hydroelectric You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
You use this word too often, consider replacing it withterminalhousedepotsitelocation
station
 can generate You use this word too often, consider replacing it withfunctiontalentinfluencecapabilitypotentialcapacity
power
is based
 on the Possible spelling mistake found.differencedifferdiffersdiffereddifférance
differce
Possible spelling mistake found.heighteighthheightshafthaftsh eighth
heighth
 of You use this word too often, consider replacing it withdrinkrain
water
 level. In day You use this word too often, consider replacing it withpointgenerationpastsecondturnspace
time
, it This phrase/word (depending on the context) can be potentially replaced with :exploits
uses
 the natural You use this word too often, consider replacing it withdrinkrain
water
You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy
. Did you forget a comma after a conjunctive/linking adverb?Meanwhile,
Meanwhile
 in the night, it transfers the You use this word too often, consider replacing it withdrinkrain
water
 to create and store the You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
energy
 for the next
 day.

Here is the examiner's comment:

The answer covers the key features of the process and provides an overview of this process in the final paragraph. The detail is not always This phrase/word (depending on the context) can be potentially replaced with :apparent
clear
, This phrase/word is too simple and can be replaced with:on the contrary
but
 the key features are adequately
 highlighted. Information is arranged
coherently
 and there is a This phrase/word (depending on the context) can be potentially replaced with :apparent
clear
overall
 progression. Cohesive devices are This phrase/word (depending on the context) can be potentially replaced with :exploited
used
 to signal This phrase/word is too simple and can be replaced with:various
different
 stages of the process [Then | On the other hand
 | This phrase/word is too simple and can be replaced with:consequently
So
 In a conclusion | Meanwhile], and there is This phrase/word is too simple and can be replaced with:a number of
some
This phrase/word (depending on the context) can be potentially replaced with :exploit
use
 of pronouns for reference [It | which | that]. The range of vocabulary is adequate for the task You use this word too often, consider replacing it withstrengthtoughnesspowervitalitystaminaefficiency
[energy
 | operated by | transfer | mechanical], This phrase/word is too simple and can be replaced with:notwithstanding
in spite of
This phrase/word is too simple and can be replaced with:a number of
some
 errors in word form [a reversed way] and spelling [Possible spelling mistake found.differencedifferdiffersdiffereddifférance
differce
Possible spelling mistake found.heighteighthheightshafthaftsh eighth
heighth
]. There is a mix of simple and complex sentence forms and grammatical control is generally
 adequate, though there are This phrase/word is too simple and can be replaced with:a number of
some
 errors in the This phrase/word (depending on the context) can be potentially replaced with :exploit
use
 of articles. 