TOPIC:
CONDITIONAL SENTENCES
TO SHOW OBLIGATION
AND NECESSITY
LEVEL:
Secondary 3 second Term
PERIOD(S): Two lessons (@40 minutes)
DESIGNER: Eric Fung Chung-yin
English Department
CCC ROTARY SECONDARY SCHOOL
Date:
29 February 2000
AIMS &
OBJECTIVES
• 1. Students are able to use “must” &
“have to” to show necessity and
obligation.
• 2. Students are able to use ‘if’ & ‘must’/
‘have to’ to make sentences to show the
conditional sentences
1. 3’
Warm up activities (a. moving paper under a glass; b. throwing an
egg.)
2. 10’ Revision of previous knowledge.
3. 30’ Grammar Point: Conditional sentences to show obligation and
necessity.
4. 15’
Games Time
5. 10’ Pair Work Activities
6. 7’
Conclusion
7. 5’
Homework for consolidation
Teaching
materials
•
•
•
•
One or two glasses; a piece of paper.
One egg.
Activity envelopes
Worksheet
CONDITIONAL
SENTENCEUSING ‘If’
SECONDARY 3
GRAMMAR
Prepared by Fung C.Y.
Do you want to
play with them?
Activities
•
•
•
•
•
Before playing the game, let’s think
What will happen if he is not careful?
The glass will fall.
The glass will break.
So he must be very careful.
•
•
•
•
•
What will happen if he is not careful?
The egg will fall.
The egg will break.
He needs to clean the floor.
So he must be very careful.
Revision on
conditional
sentences
• How do we say about them using ‘if’?
• If he is not careful, the glass will break.
• If he is not careful, the glass will fall on the
floor.
• If he is careful, he will catch the egg.
GRAMMAR
POINT
• Do you think that he must do something
in order to play better?
•
CONDITIONAL
SENTENCES
USING ‘MUST’
• TO SHOW
• ‘NECESSITY’ OR
•
‘OBLIGATION’
Examples
• If he does not want to break the glass,
he must move the paper faster.
• If he wants to catch the egg, he must
always look at it.
If they want to go
diving………...
What must they do?
Example 1
• If they want to go diving, they must
know how to swim.
• If they want to dive deeper, they must
have a bottle of oxygen.
If he wants to play
tennis, he must
have …..
Example 2
• If he wants to play tennis, he must have
a racquet.
• If he wants to play tennis, he must have
some tennis balls.
‘if’ can be put in
the middle of a
sentence.
We must bring an umbrella
if ___________________.
• We must bring an umbrella if it rains
heavily.
Let’s play !!!
See how many correct sentences
you will make.
• If you want to pass
the exams,
• If you want to keep
fit,
• If you want to
borrow books from
the library,
•you must become a
member.
•you must study hard.
•you must eat more.
•you must exercise
regularly.
Let’s play 2 !!!
• If you want to
complain about a
bus service,
• If you want to go to
bed early,
• If you want to ask a
question in class,
•you have to put up
your hand.
•you have to write to the bus
company.
•you have to buy a bus.
•you have to get up
early.
Let’s play 3 !!!
• You have to contact
a travel agent
• You have to practice
a lot
• You have to book
the tickets early
• You have to lie in
the sun
•if you want to book a holiday.
•if you want to get a suntan.
•if you want to see the show.
•if you want to buy a book.
•if you want to swim well.
PAIR WORK
(open the envelopes)
• In 3-5 minutes, rearrange the given
clauses to make good sentences using
‘if’.
• Remember, you can put the ‘if-clause’
at the beginning or the end of the
sentences.
ANSWER KEY
• If you want to pass the exam, you must work hard.
• If you want to keep fit, you must do more exercises.
• If you want to use the library, you have to keep quiet.
• You must practice a lot if you want to swim well.
• You have to lie in the sun if you want to get a suntan.
• You have to walk faster if there is a fire.
CONCLUSION
• We can use ‘if’ with modal verbs such as
‘must’ and ‘have to’ to show necessity
and obligation.
• E.g. If we want to study at school, we
must follow school regulations.
• E.g. We must not be late if we want to
be good students.
CONCLUSION
cont.
• Remember the ‘if-clause’ can be used at
the beginning or at the end of the
sentences.
• YOU HAVE TO PRACTISE MORE IF
YOU WANT TO LEARN THE
CONDITIONAL SENTENCES WELL.
SEE YOU
LATER!!!
HOMEWORK
• 1. Complete the work
sheet (Unit 9 P.1).
• 2. G.E. exercises on page 9
(Book 3B)