Conditional Sentence

Conditional Sentences
Structure :
A conditional sentence is composed of 2 parts :
If-clause
+
Main Clause
Example :
If it rains tomorrow, we will not come.
If-clause
Main Clause
Conditional Sentences
Types :
There are 4 types of conditional sentences.
They are classified according to their specific
implications.
Each type of conditional sentences uses
different tenses to show the difference in
their implications.
Conditional Sentences
Type 0 :
Use :
Talk about universal truth.
Tense :
Present tense in both clauses
Example :
If you heat water to 100°C, it boils.
Present Tense
Present Tense
If you pour oil into water, it floats.
Conditional Sentences
Type 1
Use :
Talk about a present or future probable case.
Tense :
If-clause ~ Present Tense
Main Clause ~ Future Tense
Example :
If I feel sick, I will not go to school.
Present Tense
Future Tense
If it rains tomorrow, the match will be cancelled.
Exercise One
If you ___________________ (not come),

You ________________ (miss ) the show.
do not come
will miss
John __________________ (buy)a car if he

_____________ (get)a job.
will buy
gets
Mary ________________(get) a toothache if

she_________________ (eat) too many sweets.
gets
eats
Conditional Sentences
Type 2 (Present Subjunctive)
Use :
Talk about a present or future improbable case. (A case that is unlikely to happen)
Tense :
If-clause ~ Past Tense
Main Clause ~ would + an infinitive
Example :
If he were a bird, he would fly across the harbour.
Past Tense
Would + infinitive
If I had $200,000 now, I would buy a car.
Conditional Sentences
Type 3 (Past Subjunctive)
Use :
Talk about a past, impossible case
Tense :
If-clause ~ Past Perfect Tense
Main Clause ~ Would + Present Perfect Form
Example :
If I had had enough money, I would have bought the camera yesterday.
Past Perfect Tense
Would + Present Perfect Form
If I had come home earlier, I would not have missed the programe.
Exercise Two
If I ________________ (be) four years old, I

________________ (learn) to play the piano.
were
would learn
If I ________________ (not fail) in the last
examination, my mother_______________ (buy)
me a new computer.
had not failed
would have bought
3. We ________________________ (finish) if we

________________ (have) better preparation.
would have finished
had had
Conditional Sentences
Variations:
Type 1 :
If you see John, ask him to come and see me.
Should you see John, ask him to come and see me.
SHOULD may replace IF in type 1
Type 2 :
If I were an aeroplane, I could fly in the sky.
Were I an aeroplane, I could fly in the sky.
COULD or MIGHT may replace WOULD
WERE may replace IF in an inversion
Conditional Sentences
Type 3 :
If I had come home earlier, I would not have missed the programme.
Had I come home earlier, I would not have missed the programme.
HAD may replace IF in an inversion
Conditional Sentences
Type 2 & Type 3 :
If it were not for the rain, we would go to Shatin. (Type 2)
But for the rain, we would go to Shatin.
But for+ a noun may replace `If it were not for’
If it had not been for the traffic jam, we would have arrived on time. (Type 3)
But for the traffic jam, we would have arrived on time.
But for + a noun may replace `If it had not been for’
Mixed Conditional Sentences
Mixed 1
Use :
refer to an unreal past condition and its probable result in the present
Tense :
If-clause ~ Past Perfect Tense
Main Clause ~ Would + an infinitive
Example :
If you hadn`t spent all your money on CDs, you wouldn`t be broke.
Past Perfect Tense
Would + an infinitive
If you`d caught that plane, you`d be dead now.
Mixed Conditional Sentences
Mixed 2
Use :
refer to an unreal present situation and its probable (but unreal) past result:
Tense :
If-clause ~ Past Tense
Main Clause ~ Would + Present Perfect
Example :
If she weren`t afraid of flying, she wouldn’t have travelled by boat.
Past Tense
Would + Present Perfect
If we didn`t trust him , we would have sacked him.
The Subjunctive Mood
Other sentences than the conditional may bear the subjunctive mood.
a. Wish (v)
I wish I were a king.
(But I am not!)
I wish she had left last night.
(But she didn’t!)
Type 2
Type 3
* Non-subjunctive use of wish
I wish to travel to Europe next year
We wish you a happy birthday.
The Subjunctive Mood
b. If only
If only I were you!
If only he were born in the USA!
(He was not born in USA)
If only she had left last night!
(She did not leave last night)
Type 2
Type 2
Type 3
The Subjunctive Mood
b. Would rather
I would rather you came earlier.
(But you come late.)
Type 2
I would rather he had told me the secret.
(But he didn’t.)
Type 3
* Non-subjunctive use of would rather
A : Do you want to go fishing today?
B : I would rather stay at home and take some rest.
(B prefers staying at home to going fishing)
The Subjunctive Mood
d. Lest (Conjunction)
He put the money in the safe lest someone should / might steal it.
e. It is (high) time
It is (high) time you studied hard.
(You have not studied hard. Now the examination is near, so you have to study very hard.)
Past Tense
It is time for you to leave
(non-subjunctive)
END