A.
Definition
Conditional
Sentences are also known as Conditional Clauses or If Clauses. They are used to
express that the action in the main clause (without if) can only take
place if a certain condition (in the clause with if) is fulfilled.
Example:
I
will phone my friend, if I have time today.
If
I had more time, I would do more on my websites
B.
Types of conditional sentence
There
are three types of Conditional Sentences, they are:
1.Conditional
sentence type 1
It
is possible and also very likely that the condition will be fulfilled.
Pattern:
if + Simple Present (S+V1), Simple Future (S+Will+V1)
Example:
If
I study, I will pass the exam
If
I find her address, I’ll send her an invitation.
I
will buy some Cheddar cheese if I go to England.
2.
Conditional sentence type 2
It
is possible but very unlikely, that the condition will be fulfilled.
Pattern:
if + Simple Past (S+V2), Simple Past Future (S+would+V1).
Example:
If
I found her address, I would send her an invitation.
If
I were you, I wouldn't do that
I
would do more on my websites if I had more time.
3.
Conditional sentence type 3
It
is impossible that the condition will be fulfilled because it refers to the
past.
Pattern:
if + Past Perfect (S+had+V3), Past Future Perfect (S+would+have+V3)
Example:
If
I had studied, I would have passed the exam.
You
would have failed if I hadn't helped you.
If
it had been sunny, we could have gone out.
For
more explanation please watch this video:
Exercises:
Complete
the Conditional Sentences Type I.
1.
If you ... (go) out with your
friends tonight, I ... (watch) the football match on TV.
2.
I ... (earn) a lot of money if I ... (get) that job.
3.
If she ...(hurry / not) , we ... (miss) the bus.
Complete
the Conditional Sentences Type II.
4.If
he (try) harder, he (reach) his goals.
5.
I (buy) these shoes if they (fit) .
6.
It (surprise / not) me if he (know / not) the answer.
Complete
the Conditional Sentences Type III.
7.
If we (listen) to the radio, we (hear) the news.
8.
If you (switch) on the lights, you (fall / not) over the chair.
9.
She (come) to our party if she (be / not) on holiday.
Complete
the Conditional Sentences with the correct form (Type I, II or III).
10.
If I ... (tobe) stronger, I'd help you carry the piano.
11.
If ... (stop), we'd seen you, we
12.
If we ... (meet) him tomorrow, we'll say hello.
13.
He would have repaired the car himself if he ...(have) the tools.
14.
If you drop the vase, it ...(break).
15.
If I hadn't studied, I ... (not-pass) the exam.
16.
I wouldn't go to school by bus if I ... (have) a driving licence.
17.
If she ... (not-see) him every day, she'd be lovesick.
18.
I ... (not-travel) to London if I don't get a cheap flight.
19.
We'd be stupid if we ... (tell) him about our secret.
20.
Our team in would have been better form if they ... (train) harder the weeks
before
Sources:

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