Conditional Sentences / If-Clauses Type I, II und III
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. There are three types of Conditional Sentences.
Conditional Sentence Type 1
→ It is possible and also very likely that the condition will be fulfilled.
Form: if + Simple Present, will-Future
Example: If I find her address, I’ll send her an invitation.
more on Conditional Sentences Type I ►
Conditional Sentence Type 2
→ It is possible but very unlikely, that the condition will be fulfilled.
Form: if + Simple Past, Conditional I (= would + Infinitive)
Example: If I found her address, I would send her an invitation.
more on Conditional Sentences Type II ►
Conditional Sentence Type 3
→ It is impossible that the condition will be fulfilled because it refers to the past.
Form: if + Past Perfect, Conditional II (= would + have + Past Participle)
Example: If I had found her address, I would have sent her an invitation.
more on Conditional Sentences Type III ►
Exceptions
Sometimes Conditional Sentences Type I, II and III can also be used with other tenses.
Exercises on Conditional Sentences Type 1

Partyvorbereitung
Some friends are planning a party. Everybody wants to party, but nobody`s really keen on preparing and organising the party. So everybody comes up with a few conditions, just to make sure that the others will also do something.
Complete the Conditional Sentences Type I.
If Caroline and Sue
the salad, Phil
the house.
If Sue
the onions for the salad, Caroline
the mushrooms.
Jane
the sitting room if Aaron and Tim
the furniture.
If Bob
up the kitchen, Anita
the toilet.
Elaine
the drinks if somebody
her carry the bottles.
If Alan and Rebecca
the food, Mary and Conor
the sandwiches.
If Bob
after the barbecue, Sue
the guests in.
Frank
the DJ if the others
along their CDs.
Alan
the drinks if Jane
him some of her cocktail recipes.
If they all
their best, the party
great.
Exercises on Conditional Sentences Type 1

Complete the Conditional Sentences (Type I) by putting the verbs into the correct form.
If you (send)
this letter now, she (receive)
it tomorrow.
If I (do)
this test, I (improve)
my English.
If I (find)
your ring, I (give)
it back to you.
Peggy (go)
shopping if she (have)
time in the afternoon.
Simon (go)
to London next week if he (get)
a cheap flight.
If her boyfriend (phone / not)
today, she (leave)
him.
If they (study / not)
harder, they (pass / not)
the exam.
If it (rain)
tomorrow, I (have to / not)
water the plants.
You (be able/ not)
to sleep if you (watch)
this scary film.
Susan (can / move / not)
into the new house if it (be / not)
ready on time.
Exercise on Conditional Sentences Type 2

Janine is a daydreamer. She imagines what would happen if she won the lottery.
Complete the Conditional Sentences Type II.
If I
the lottery, I
a chance to hit the jackpot.
If I
the jackpot, I
rich.
If I
rich, my life
completely.
I
a lonely island, if I
a nice one.
If I
a lonely island, I
a huge house by the beach.
I
all my friends if I
a house by the beach.
I
my friends up in my yacht if they
to spend their holidays on my island.
We
great parties if my friends
to my island.
If we
to go shopping in a big city, we
a helicopter.
But if my friends` holidays
over, I
very lonely on my lonely island.
Exercise on Conditional Sentences Type 2

Complete the Conditional Sentences (Type II) by putting the verbs into the correct form. Use conditional I with would in the main clause.
If we (have)
a yacht, we (sail)
the seven seas.
If he (have)
more time, he (learn)
karate.
If they (tell)
their father, he (be)
very angry.
She (spend)
a year in the USA if it (be)
easier to get a green card.