This usually refers to a future event which is conditional on another future event.
The verb of the main clause is in the future tense with "will" (or sometimes another modal).
The verb of the conditional clause is in the simple present tense.

If you eat too much, you'll get fatter.
You'll get fatter if you eat too much.
If everyone works fast, we'll finish in time.
We won't finish in time unless everyone works fast.
If I go to London, I can visit the British Museum.
If you visit Scotland, you should visit Edinburgh Castle.
Unless the directors can increase sales, we'll have to close this shop.

Occasionally, the open conditional statement describes one potential state of reality or circumstance which is dependent on another. In this case, both verbs are in the present tense.

If I sleep well at night, I feel much happier next morning.
If the temperature falls below zero, it freezes.
If it rains, everyone gets wet.

In an open conditional statement, if is sometimes replaced by when: but there is a difference. Using "if" implies that the condition really is open and may not be fulfilled, using "when" implies that the condition will be fulfilled, that the event will really take place.

Type 2. The open hypothetical conditional statement:

This refers to a possible future situation which depends on on another possible future situation. The verb of the main clause uses the present conditional tense (would + infinitive, or could +infinitive);
The verb of the conditional clause normally uses the present subjunctive or preterite (these two tenses are identical except with to be). Occasionally, the conditional aspect of the statement can be emphasised by using the form were + to + infinitive.

1A If you ate too much, you'd (you would) get fatter.
1B You'd get fatter if you ate too much.
2A If everyone worked faster, we would / could finish in time.
2B We wouldn't finish in time unless everyone worked faster.
2C If everyone were to work faster, we would/could finish in time.
3 If I went to London, I would / could visit the British Museum.
4. If you visited Scotland, you could see Edinburgh Castle.
5 Unless the directors increased sales, we'd have to close this shop.

Note also this common expression (which uses the open hypothetical form, though it is clearly quite impossible!)

6. If I were you, I'd ..........

As in: If I were you, I'd go a bit slower / If I were you, I'd put that gun down !!

This form is also used in cases of reported speech.

My professor told me I'd do much better if I worked harder.
The magistrate informed him that he'd go to prison unless he stopped stealing.
The newspaper reported that unless the directors could increase sales, they'd have to close the shop.

Type 3. The unfulfilled hypothesis

This refers to a situation which an event might have taken place, but did not, because a condition was not fulfilled.
The verb of the main clause goes in the past conditional (would have + past participle).
The verb of the conditional clause goes in the past perfect (had + past participle).
Examples:

If you had eaten too much, you'd (you would) have got fatter.
You'd have got fatter if you'd eaten too much.
If everyone had worked fast, we'd have finished in time (but we didn't).
We wouldn't have finished in time unless everyone had worked fast (but we did).
If I had gone to London, I could have visited the British Museum (but I didn't).
If you had visited Scotland, you could have visited Edinburgh Castle (but you didn't).
Unless we'd been very confident of success, we wouldn't have even tried. (But we were confident, we did try, and we succeeded).

Note: using " unless"

"Unless" means the same as "if ... not", and has a negative value. It is frequently (but not only) used in conditional statements where the verb of the main clause is also in the negative.

You wouldn't have fallen over unless there'd been a banana skin on the ground.
= You wouldn't have fallen over if there hadn't been a banana skin on the ground.

4 Omission of "if", with inversion.

Sometimes, hypothetical conditional statements or unfulfilled hypothetical statements can be expressed omitting the word if.
When this happens the subject follows the auxiliary verb in the conditional clause
Examples:

Were the virus to reappear, hospitals would now be ready for it. (open hypothesis)
= If the virus reappeared, hospitals would now be ready for it.
or If the virus were to reappear, hospitals would now be ready for it.
Had I known, I'd never have gone there (unfulfilled hypothesis; implying "I did go there because I did not know".)
= If I had known, I'd never have gone there.

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The Conditional in English

The conditional clause in English: Clauses with if or unless

Type 1. The open conditional statement :

Type 2. The open hypothetical conditional statement:

Type 3. The unfulfilled hypothesis

Note: using " unless"

4 Omission of "if", with inversion.

The conditional clause in English:
Clauses with if or unless