14.2.4 Some important conjunctions - wenn

  wenn = when, if
Wenn er es weiß, sagt er es euch.
When he knows he'll tell you. / If he knows he'll tell you.
  Wenn er seine Hausaufgaben macht, lernt er es.
If he does his home work he'll learn it.
  Wenn er müde ist, schläft er.
He sleeps when he is tired.

Sometimes it is difficult to decide whether the conjunction wenn does mean if or when. Usually it becomes clear from the context.

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