1 First conditional
If + present followed by will is used to imagine the concequences of events that are likely to happen or to describe the concequences of events that always happen:
If our flight lands on time, we'll arrive in time for lunch.
If you book your summer holiday in December, you'll get a discount.
If you intend to go to the USA, you'll have to get a visa.
If you've seen "Rambo", you'll love "Rambo II".
If water is heated to 100 C, it will boil. (OR: If water is heated to 100 C, it boils.)
The example in brackets is sometimes called a "Zero Conditional". It is only used to talk about events and consequences that always happen:
If the sun shines, the temperature rises.
Water freezes if the temperature falls below 0 C.
Unless (='except if') and in case can also be used in the first type of conditional sentences:
I won't give you a present unless it's your birthday.
You won't be able to get into the concert unless you've got a ticket.
I'll bring a jumper in case it gets colder in the evening.
I'll teke a map with me in case I get lost.
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