Adverb Clause

 Adverb clause of time are introduced by when, while, as, as soon as, once, before, after, until, as long as= so long as, by the time, since, the last time (that), the next time, the first time, ever (whenever, wherever).
          'When' means 'at that moment, at that time, etc…. Notice the different tenses used in relationship to the clause beginning with when. It is important to remember that 'when' takes either the simple past OR the present - the dependent clause changes tense in relation to the 'when' clause.

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