Abstract
Line drawings of simple situations, in which the animacy of both actor and acted-upon was systematically varied, were presented to children aged between five and 10 years and to adults. Their task was to describe what was happening in each picture. When the actor was more animate than the acted-upon the pictures were invariably described in the active voice whereas pictures in which the acted-upon was more animate than the actor were frequently described using a passive. When the animacy of the two elements was equal a smaller number of passives was produced mainly in response to pictures depicting two inanimates. The size of the animacy difference between actor and acted-upon was also found to influence passive production. In the more animate acted-upon condition most passives were produced to describe pictures of an inanimate actor and human acted-upon. This pattern of responses is seen as providing support for a view of the passive as a syntactic form which allows thematisation of an acted-upon when it is of greater importance to the speaker than the actor.

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