为了帮助小学生更好地掌握英语同义句转换，常见的口诀有：

1. 加否定，意思不变。

Negatives make no change.

2. 句首变，意思全变。Start it differently, meaning is new.

3. 名词复数别忘加。Plurals please, don't forget that.

4. 疑问句，换句序。Questions flip words around some more.

5. 意思近，换个表达。Similar ideas rephrase, don't be afraid.

6. 词性变，意思新。Changing words can freshen up the view.7. 从句前，先导入。Into the sentence introductions go.这些简单易记的口诀可以帮助小学生轻松地记住同义句转换的基本规则，提高他们的英语语感和表达能力。