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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