在进行扩句与缩句的教学过程中,我们发现有的学生对自己扩充和紧缩的句子正确与否,心中无把握。针对这一情况,我们试行运用扩句与缩句的互逆关系来检验其正误的方法,效果很好。如:扩充句子“王明打扫教室”。学生把这一句扩充为“我和王明一起认真地打扫六年级教室内外”,认为只要添加了与原句有关的词语就行了。我们引导他们将所扩充的句子再进行紧缩,结果紧缩成“我和王明打扫教室内外”,这样的句子与原来句子的意思不一样了。通过对比,他们能够比较清楚地认识到,扩句不能乱加 In the process of teaching expansion and contraction, we find that some students have no confidence in the correctness of their own expansion and contraction sentences. In response to this situation, we try to use the reciprocal relationship between extended and contracted to test its correct method, works well. Such as: to expand the sentence “Wang Ming clean the classroom.” Students expanded this sentence by saying “I cleanly cleaned both the inside and outside the sixth-grade classroom with Wang Ming,” saying that as long as the words related to the original sentence were added, it would be fine. We guide them to tighten the expanded sentences and tighten them into “I and Wang Ming clean the inside and outside the classroom”. Such sentences have different meanings from the original sentence. By contrast, they can more clearly understand that the expansion of sentences can not be undone