The simple present tense is used:
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To express habits, general truths, repeated actions or unchanging situations, emotions and wishes:
I smoke (habit); I work in London (unchanging situation); London is a large city (general truth)
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To give instructions or directions:
You walk for two hundred meters, then you turn left.
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To express fixed arrangements, present or future:
Your exam starts at 09.00
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To express future time, after some conjunctions: after, when, before, as soon as, until:
He'll give it to you when you come next Saturday.
