Ex.: If you heat ice, it melts.
If I make a promise, I keep it.
These sentences are statements of universal truth or general validity, and in this type of sentencem "if" corresponds closely in meaning to "when(ever)". Statements in this form appear in factual discussions or explanatory (Particularly scientific and technical) material. The tenses in both the conditional and the main clause are the same. The sentence "If I make a promise may be written in the past tense with a similar correspondence between the verb forms in the two clauses: "If I made a promise, I kept it."
Exercise: answer the questions like in the examples above.
What happens if flowers don´t get any water?
What must a motorist do if the traffic lights are at red?
What materials do you need if you want to write a letter?
What do you like to drink if you are very thirsty?
Who do business men go to see if they want to borrow money?
What do you expect a teacher to do if you make a mistake?
What must one have if one wants to visit a foreign country?
Who do people go to see if they feel ill?
What happens if there is a power failure?
How do people dress in your country if they work in an office?
(Advanced English Practice - B.D. Graver - Oxford)
Some more examples:
If you get there before eight, we can catch the early train.
If you get there before eight, we catch the early train.
If I´m earning well, I pay lunch for my friends.
If you´re hungry, have something to eat.
If the phone rings, can you answer it, please?
Do you mind if I use your phone?
I´m going to the concert if I can get a ticket.
If you get a high paying job, you pay dinner for us.
If you get a high paying job, you can travel first class.
If you get a high paying job, you pay higher taxes.
If you get a high paying job, you make more friends.
If you get a high paying job, you buy what you want.
If you go out, you must take and umbrella.
should
ought to
needn´t
may
can
Source: several books!
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