English 8 – Global Success

Unit 7:
ENVIRONMENTAL PROTECTION
Lesson 3: A CLOSER LOOK 2
GRAMMAR: Complex sentences with
adverb clauses of time

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Lay out
WARM-UP

Adverb clauses of time

PRESENTATION

PRODUCTION
CONSOLIDATION

• Task 1: Read the sentences and write I.C if the
underlined clause is an independent clause or D.C if it is
a dependent clause.
• Task 2: Choose A, B, or C to complete each sentence.
• Task 3. Match the clauses in the two columns to form
complex sentences.
• Task 4: Combine each pair of sentences, using the
conjunction in brackets.

• Task 5: Matching game.
• Wrap-up
• Homework

01
Warm-up
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ADVERB CLAUSES OF TIME
1. I always take a bath before I go to bed.
2. Will you wait here until I am ready?
3. I was not at home when he came to see me.
4. Do not disturb me when I am busy with my work.
5. As soon as she finished that project, she started
working on the next.

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6. After I have finished my work, I will accompany you to
the park.

EXTRA ENVIRONMENTAL ISSUES:
Overpopulation: The increasing population has led to a shortage of
resources. If this continues, it will be very difficult to sustain such a huge
population.
Deforestation: is the depletion of trees and forests at an alarming rate. The
trees provide us with oxygen, and several raw materials and also maintain
the temperature of the earth. Due to the depletion of trees for commercial
purposes, there has been a drastic change in the earth's climate.

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Air Pollution: is the result of emissions from industries, automobiles, and
the increasing use of fossil fuels. The gaseous emissions have added to an
increase in the temperature of the earth. Not only this, but it had also
increased the risk of diseases among individuals.

EXTRA ENVIRONMENTAL ISSUES:
Water Pollution: The introduction of harmful substances into rivers, oceans,
lakes and ponds, which changes the physical, chemical or biological condition
of the water is called water pollution. The polluted water lacks oxygen and
therefore the organisms die.  Water is the main source of life and therefore it is
our prime duty to prevent it from any kind of pollution.
Climate Change: Climate change is a great concern in today's scenario. This
problem has surfaced in the last few decades. Greenhouse gases are the major
cause of climate change. Environmental changes have several destructive
impacts such as the melting of glaciers, change in seasons, epidemics, etc.

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Global Warming: The burning of fossil fuels, emissions from automobiles and
chlorofluorocarbons add to the greenhouse gases in the atmosphere. This has
led to an increase in the earth's temperature causing environmental changes.
This increase in temperature across the globe is known as global warming.

02
PRESENTATION

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Complex sentences with
Adverb clauses of time
– A complex sentence contains one independent clause and at least
one dependent clause.
Example:
The roads were slippery
when it rained.
independent clause
dependent clause
– An adverb clause is a dependent clause.
– An adverb clause of time shows when something happens. It is
usually introduced by time connectors: before, after, when, while, till /
until, as soon as, …

1 Read the sentences and write I.C if the underlined clause is
an independent clause or D.C if it is a dependent clause

Example:
You must be careful when you cross the street. DC
1. I'll wait for you here until you get back. IC
2. Make sure you lock the door when you go out. DC
3. You must get a permit before you build a campfire at a national park.
4. Don't use too much water while you are having a shower. DC
5. As soon as my friends come, we will pick up rubbish on the beach.

DC

IC

2

Choose A, B, or C to complete each sentence.

1. I was not at home ______ he came to see me yesterday.
A. when

B. until

C. as soon as

2. We called the forest guard unit ______ we saw the bush fire.
A. as soon as

B. while

C. until

3. I went straight to the gym ______ I left home.
A. while

B. before

C. after

2

Choose A, B, or C to complete each sentence.

4. You can stay with us ______ you find a suitable place to stay.
A. as soon as

B. before

C. until

5. We cleaned up everything at the campsite ______ we left.
A. until

B. before

C. while

3

Match the clauses in the two columns to form complex sentences

1. b
2. d
3. e
4. c
5. a

4

Combine each pair of sentences, using the conjunction in brackets

1. I arrive at the station. I will call you right after. (as soon as)

I will call you as soon as I arrive at the station.
=> _____________________________
2. Many Vietnamese women wear conical hats. They work in the field. (when)

We have to follow the steps when we make a conical hat
=> _____________________________
3. My father taught me how to use the computer. Then he bought one for me. (before)

father taught me how to use the computer before he bought
=> My
_____________________________
one for me.

4

Combine each pair of sentences, using the conjunction in brackets

4. Nick is reading a novel. Jack is reading a cartoon. (while)
_____________________________
Nick is reading a novel while Jack is reading a cartoon.
5. The tornado hit. There were only a few houses left standing. (After)
_____________________________
After
the tornado hit, there were only a few houses left standing.

03
PRODUCTION

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Work in two groups, A and B.

5 Matching game:

Group B write adverb clauses of time.

Group A write main clauses.

Do they match? Are there any funny sentences?

Team A
Don't use the
cell phone
He went to
work

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Bring me
some water

I saw James
driving a
Porsche.
She went
abroad

Team B
 before you
go.
 As I was
walking down
the street,
 after he
finished his
studies.

while you are
driving.

 after he fed
the cats.

04
Consolidation

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1 Wrap-up
What have we learnt in this lesson?
 use the Complex sentences with
adverb clauses of time;

2

Homework
Workbook

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Thank you
for your
attention!