Oh,yes.It improves my speaking skills.中speaking为什么加ing

Oh,yes.It improves my speaking skills.中speaking为什么加ing It improves my speaking skills. 为什么用speaking而不用speak It improves my speaking skills（改为一般疑问句） It really improves my speaking skills 还有这个 it ()my speaking skills() it improves my ____speaking___ skills这句话中的划线词语为什么用ing形式 You must improve your speaking skills.中为什么用speaking 说的技能是speaking skills吗 为什么要加ing 和s speaking skills 为什麽speak要加ing speaking skills It helrs me with my speaking skills.这里的 speaking能不能换成spoken? Bob is good at speaking English.speaking为什么要加ing.急