Zero and First Conditionals

CONDITIONAL SENTENCES

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• The "if clause" may be either at the beginning or at the end ,but if the if-clause comes first, it must be followed by a comma.
• If it rains, I’ll stay at home.
• I´ll stay at home if it rains.

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• Conditional Sentences Types:
• Zero Conditional:
• Present simple + present simple
• Water boils if it reaches 100 º
• First Conditional:
• Present simple + future
• If I study, I will pass.
• 

ZERO CONDITIONAL

• A zero conditional sentence is made up by two present simple verbs - one in the “if clause” and one in the main clause.
• If + present simple, .... present simple.
• We use this conditional when the result will always happen.
• For instance, if water reaches 100 degrees, it always boils. This is a fact.
• This is something in general, we are not talking about one particular situation.
• The result of the 'if clause' is always the main clause.

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• In this conditional, the "if" can usually be replaced by when without changing the meaning.
• So, it is true that:
• If water reaches 100 degrees, it boils.
• However, if I eat pupusas, I get sick. (This is true only for me, maybe, not for everyone, but it's still true that I get sick every time I eat pupusas)
• 

SOME OTHER EXAMPLES

• If people eat too much fast food, they get fat.
• If you touch a fire, you get burned.
• People die if they don't eat for a long time.
• You get water if you mix hydrogen and oxygen.
• Snakes bite if they are scared.
• If babies are hungry, they cry.

The First Conditional

• The first conditional has the present simple after 'if', then the future simple in the other clause:
• if + present simple, ... will + infinitive
• This one is used to talk about things which might happen in the future. Of course, we can't know what will happen in the future, but this describes possible things, which could easily come true.

OTHER EXAMPLES

• If it rains, I won't go to out tonight.
• If I study today, my mom will let me go to the party tonight.
• If I have enough money, I'll buy some new jeans.
• I'll be late if the train is delayed.
• She'll miss the bus if she doesn't leave soon.
• If I see her, I'll give her your message.

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• ZERO CONDITIONAL
• · Use:
• Talk about universal truth.
• If you heat ice, it turns to water
• To give commands
• If you are tired, go to bed!
• FIRST CONDITIONAL
• ·Use:
• To speak about possible or probable future events.
• If the weather is sunny tomorrow, we will go surfing.
• To make promises or warnings
• If you forget my birthday, I’ll never speak to you again.