semantic alternation造句

on the one hand, quite a lot of svo constructions have no passive equivalences, nd on the other hand, some passive conversions do show semantic asymmetry in the semantic alternation
不仅有许多“主谓宾”结构没有被动语态，而且许多语句经过语态转换就会引起较大的语义变化。
It's difficult to find semantic alternation in a sentence. 用semantic alternation造句挺难的