a or an

  1. C

    When was a/an introduced in English?

    When was the indefinate article a/an introduced in English?
  2. G

    Pavlov’s dogs were taught to salivate to the sound of a bell. The bell was a/an?

    conditioned response conditioned stimulus unconditioned response unconditioned stimulus
    • garnetgirl
    • Thread
    • a or an bell dogs pavlov’s salivate sound taught
    • Replies: 2
    • Forum: Bell
  3. J

    the opposite of a delivery truck is called a/an..... truck ?

    I'm not quite sure if it is called an unloading truck.
    • JIB
    • Thread
    • a or an called delivery opposite truck
    • Replies: 0
    • Forum: Trucks and SUV
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