'The' is the choice there if you wish to teach natural English. The 2nd mention of a particular item takes the definite article. A: I bought a new car.
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CoincidenceI am showing various objects and saying : This is a teddy. This is a doll. This is a ball, etc.OK. So far, so good.
CoincidenceShould I say : Point to a teddy. Point to a doll. or Point to the teddy. Point to the doll.If you have several teddies and several dolls to point to, Point to a ... makes sense.