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UNIT 11. OUR GREENER WORLD
LESSON 3: A CLOSER LOOK 2

LESSON 3
Articles
Write a or an.

Grammar
Combine each pair of sentences below to
make a first conditional sentence.

Write a / an or the.

First conditional
Write the correct form of each verb in brackets.

Fun matching
Work in groups, A and B.

I. Articles: a, an, and the (mạo từ a, an, the)

a pencil

an orange

the sun

Mạo từ chưa xác định (a/an)

- a/an dùng trước danh từ số ít đếm được.
a dog, a table, an apple…
- a/an có nghĩa là một
- a/an dùng trước danh từ được nhắc đến
lần đầu tiên
a/an + (adj) + N
- Trong đó :
“a” dùng với các danh từ hoặc tính từ
bắt đầu bằng phụ âm
“an” dùng với các danh từ hoặc tính từ
bắt đầu bằng nguyên âm (u,e,o,a,i)
An ant is a tiny animal

Mạo từ xác định (the)

- dùng trước danh từ nhắc đến lần
2 hoặc là vật ai cũng hiểu:

The bike in front of her house is nice
- trước danh từ là duy nhất

The air is dirty
The sun is hot.

Write a or an.

egg
1. ___
an egg

mouth
5. ____
a mouth

friend
a friend
2. ___

onion
6. ____
an onion

sink
3. ___
a sink

umbrella
an umbrella
7. ____

arm
4. ___
an arm

classmate
8. ____
a classmate

Write a / an or the.

1.

My father is a doctor.
_______ doctor.

2.

_______
The
Sun keeps
Sun keeps
the _______
Earth warm.
Earth warm.

3.

A
_______
dolphindolphin
is an intelligent
is _______
intelligent
animal.
_______
intelligent
animal.
animal.

4.

orange
I have an_______
orange shirt
too.shirt too.

5.

blue
pen,
notnot
the______
red one.
_____
blue
pen,
My brother likes the
red one.

II. First conditional
(câu điều kiện loại 1)
Thì hiện tại đơn

Thì tương lai đơn

Example: If you use
will save
save a lot of trees.
use less paper, you will
Mệnh đề If (Nếu)
Mệnh đề chính

Write the correct form of each verb in brackets.

1. If it (be)______
is sunny next week, we (go) _______
will go on a picnic.
2.

If we (recycle) recycle
_______
we (help)
_______
will help
_______
the Earth.
the Earth.
more,more,
we (help)

3.

We (save)

4.

have fresh water if we (use) _____
More people (have) will
_______
use less water.

5.

will_______
be moremore
fish. fish.
If the river (not be) isn't / is
not dirty,
there
(be)(be)
_______
dirty,
there

don't waste so much paper.
_______
will
save a lot of trees if we (not waste) ___________

Combine each pair of sentences below to make a first conditional
sentence.
1.

The air isn't fresh. People cough.

2.

The water is dirty. A lot of fish die.

3.

We cut down trees in the forest. There are more floods.

4.

There is too much noise. People don't sleep.

5.

There is no water. Plants die.

Gift box secret
game

GO

HẾT
GIỜ

01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
6. My mother is______ teacher .
A: the
GO
HOME

B: an

C: a
You
get 8
points

5. There is no water. Plants die.

HẾT
GIỜ

01
02
03
04
05
06
07
08
09
10
11
12
13
14
15

A: If there is no water, plants will die.
B: If there is water, plants will die.
GO
HOME

C: If there is no water, plants die.

You get
a piece
of cake

4. There is too much noise. People don't sleep.

HẾT
GIỜ

01
02
03
04
05
06
07
08
09
10
11
12
13
14
15

A: If there isn't too much noise, people will not / won't sleep.
B: If there is too much noise, people will not / won't sleep.

C: If there is too much noise, people will sleep.
GO
HOME

You get
9 points

3. We cut down trees in the forest. There are more floods.

HẾT
GIỜ

01
02
03
04
05
06
07
08
09
10
11
12
13
14
15

A: If we cut down trees in the forest, there will more floods.
B: If we cut down trees in the forest, there be more floods.
C: IfIfwe
C:
wecut
cutdown
downtrees
treesin
inthe
theforest,
forest,there
therewill
willbe
bemore
morefloods.
floods.
GO
HOME

You get
a gift

1. The air isn't fresh. People cough.

HẾT
GIỜ

01
02
03
04
05
06
07
08
09
10
11
12
13
14
15

A: If the air is fresh, people will cough.
B: If the air isn't fresh, people will cough.

C: If the air isn't fresh, people won't cough.
GO
HOME

You get
a gift

2. The water is dirty. A lot of fish die.

HẾT
GIỜ

01
02
03
04
05
06
07
08
09
10
11
12
13
14
15

AA:: IfIf the water is dirty,
dirty, aa lot
lot of
of fish
fishwill
willdie.
die.
B: If the water is dirty, a lot of fish won't die.
C: If the water isn't dirty, a lot of fish will die.
GO
HOME

You get
a gift

Combine each pair of sentences below to make a first conditional
sentence.
1.

The air isn't fresh. People cough.
If the air isn't fresh, people will cough.

2.

The water is dirty. A lot of fish die.
If the water is dirty, a lot of fish will die.

3.

We cut down trees in the forest. There are more floods.
If we cut down trees in the forest, there will be more floods.

4.

There is too much noise. People don't sleep.
If there is too much noise, people will not / won't sleep.

5.

There is no water. Plants die.
If there is no water, plants will die.

Fun matching

Work in groups, A and B.
Group A secretly writes five if-clauses on
a sheet of paper.
Group B secretly writes five main clauses
on another sheet of paper.
Match the if-clauses with the main
clauses.
Do they match? Are there any funny
sentences?