Grammar Rules

The simple present tense is used:

• 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)
• To give instructions or directions:
  You walk for two hundred meters, then you turn left.
• To express fixed arrangements, present or future:
  Your exam starts at 09.00
• 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.