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We use zero conditional it when we talk about something that is always true. If you heat water to 100 ° Celsius it will boil - and this is a fact. It is not different.

Form
if  Podmiot+  Present Simple, Podmiot + Present Simple
or
Podmiot + Present Simple + if + Podmiot + Present Simple

Ex.
If i do not eat to much, I lose my weight
Water boils if you heat it to 100 degrees.

Instead of if, you can also use when, a s long as and u nless
Ex.
When you have fever, you stay at home
As long as you are here nothing happens.
Unless you heat water to 100 degrees, it doesn't boil.

Conditional zero. -Something is always true, and the condition always gives the same result.

More examples:
If you mix red and blue, you get purple.
Plants die if they don't get  water.
If you touch a fire, you get burned
Snakes bite if they are scared

Exercises:
1.If he ...  (to stop) breathing, he starts choking.

2. If he wears braces, his trousers ... (not / to fall).

3. If a car is out of fuel, it ... (to stop) beside the road.

4. If a plane  ...  (to be) out of fuel, it falls.

5. If he  ... (not / to swim) anymore, he sinks in deep waters.

6. If she ...  (to breathe), she lives.

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Using first conditional appears while talking about the event in the future that is likely to happen. For example your friend is sick and you want to give him notes from lessons, but he called you and said that he is feeling better and he probably will be at school tomorrow, so you'll be able to give him these books.  That is likely to happen but not sure in 100%.

If my friend is at school tomorrow, I will give him the notes.
or
I will give my friend the notes,  if he's at school tomorrow.

Form
if+Present Simple,WILL + bezokolicznik
or
WILL + bezokolicznik if+Present Simple

More examples:

If the weather is fine on Saturday, we'll go for a long walk.
She will kiss you if you give her flowers.
You'll be there on time unless the bus is late.
We'll do it for you if you promise not to tell anyone about that.

Exercises :
1. I     the dishes if you    the living room. (wash, clean up)

2. I    you in the garden tomorrow if you     me. (help, need)

3.If we     to the concert, we     my favourite band. (go, see)

4.You     a shock if you     that box. (got, open)

5.If we    to the park, we     have an ice cream by the lake. ( go, might )

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Second conditional is used in situations/actions in the present or future which are not likely to happen or are imaginary, hypothetical or impossible.

Form
if + past simple, ...would + infinitive

If I were ....
Note that with the verb To Be we use IF + I / he / she / it + WERE
Example:
If she were my daughter, I wouldn’t let her drop out of school.
(NOT If she was my daughter, …)

Sometimes we can use should, could or might instead of would.
Examples:
If I had more money, I could buy a car.
If I won the lottery, I might give all the money to charity.

Exercises:
1.  If he ....  (be) younger, he .... (travel) more.
2. They ... (go) to Spain on holiday if they ... (like) hot weather.
3. If I ... (be) you, I ... (get) a new job.
4. If we ... (win) the lottery, we ... (travel) the world.
5. She ... (pass) the exam, if she ... (study) more.

More exercises :

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Second conditional exercises: affirmative sentences. Elementary and intermediate level esl.

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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

She wouldn't have been tired if she had gone to bed earlier

She would have become a teacher
if she had gone to university

He would have been on time for the interview if he had left the house at nine

Exercises:
1.If you     (not/be) late, we     (not/miss) the bus.

2.If she   (study) she

(pass) the exam.

3.If we   (arrive) earlier, we (see) John.

4. If they   (go) to bed early, they      (not/wake) up late.

5.If he (become) a musician, he    (record) a CD.

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https://www.ang.pl/
https://dictionary.cambridge.org/grammar/british-grammar/conditionals-if?q=First+and+second+conditional+compared

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even if

but for

if in doubt

if it weren’t for

if it hadn’t been for,

if necessary

if not

if possible

if so

in case

only if

so/as long as

providing/provided (that)

suppose/supposing

unless

what if

when

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When

Unless = if not (First conditional)

Providing/Provided

As long as = only if (Zero and First Conditionals)

Supposing/Supposed (Unreal Conditionals

Imagine (Unreal Conditionals)

In case

On condition that

All conditionals in English in 4 minutes :

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All conditionals in English - 0 1 2 3 and mixed - English grammar lesson