Only()“can we ”really learn some English songs

Only(in this way)“can we ”really learn some English songs
Only(in this way),we can really learn some English songs
请注意逗号(comma,",")的妙用
再问： 什么妙用？还有为什么是can we而不是we can？
再答： 因为没有逗号, 要用倒装法 (can we) 逗号(comma, ",")的使用, 就可以用 we can