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The Zero Conditional

We can make a zero conditional sentence with two present simple verbs (one in the 'if clause' and one in the 'main clause'):

If + present simple, .... present simple.

This conditional is used when the result will always happen.

Here are some more examples:

If people eat too much, they get fat.
If you touch a fire, you get burned.
People die if they don't eat.

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The first conditional has the present simple after 'if', then the future simple in the other clause:

if + present simple, ... will + infinitive

For example:

If it rains, I won't go to the park.

If I study today, I'll go to the party tonight.

If I have enough money, I'll buy some new shoes

First vs. Zero Conditional:
The first conditional describes a particular situation, the zero conditional describes what happens in general.

For example (zero conditional): if you sit in the sun, you get burned

But (first conditional): if you sit in the sun, you'll get burned
.

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The second conditional uses the past simple after if, then 'would' and the infinitive:

if + past simple, ...would + infinitive

It has two uses:

First, we can use it to talk about things in the future that are probably not going to be true. Maybe I'm imagining some dream for example.

If I won the lottery, I would buy a big house.(I probably won't win the lottery)

If I met the Queen of England, I would say hello.

Second, we can use it to talk about something in the present which is impossible, because it's not true.

If I had his number, I would call him. (I don't have his number now, so it's impossible for me to call him).

If I were you, I wouldn't go out with that man

How is this different from the first conditional?

This kind of conditional sentence is different from the first conditional because this is a lot more unlikely.

For example (second conditional): If I had enough money I would buy a house with twenty bedrooms and a swimming pool (I'm probably not going to have this much money, it's just a dream, not very real)

But (first conditional): If I have enough money, I'll buy some new shoes (It's much more likely that I'll have enough money to buy some shoes)

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We make the third conditional by using the past perfect after 'if' and then 'would have' and the past participle in the second part of the sentence:

if + past perfect, ...would + have + past participle

It talks about the past. It's used to describe a situation that didn't happen, and to imagine the result of this situation.

If she had studied, she would have passed the exam (but, really we know she didn't study and so she didn't pass)

If I hadn't eaten so much, I wouldn't have felt sick (but I did eat a lot, and so I did feel sick).

If we had taken a taxi, we wouldn't have missed the plane

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1. If he … (practice) every day, he … (become) a champion.

2. She … (help) us if we … (ask).

3. I … (go) to the police if I … (be) you.

4. If you … (have) a driving license, you … (get) this job.

5. If you … (go) with me to Paris last month, you … (see) the Eifel Tower too.

6. I … (visit) Sarah yesterday if I … (know) that she was ill.