后面加介词of，例如：
1.Speaking of travelling, are you going anywhere exciting this year?说到旅游，你今年要去什么好玩的地方吗？
2.There's plenty of time to drop hints for Christmas presents! And speaking of presents, we have 100 exclusive fragrance collections to give away.还有足够的时间去暗示自己想要的圣诞礼物！说到礼物，我们有100份限量版香水要赠送。
3.It was as though Corinne was already dead: they were speaking of her in the past tense.科琳娜好像已经去世了：他们谈论她时用的是过去时。
speaking + 动词原形：表示“说话，发言”的意思，后面接动词原形，表示说话、发言的动作。例如：Speaking English is very important for communication.
speaking + 动名词：表示“就某事而言，从某方面来说”的意思，后面接动名词，表示说话、谈论的内容。例如：Speaking of sports, I like soccer.
speaking + 代词：表示“就某人而言，就某事来说”的意思，后面接代词，表示说话、谈论的对象。例如：Speaking of you, I think you are very talented.
speaking + 介词短语：表示“从某方面来说”的意思，后面接介词短语，表示说话、谈论的方向。例如：Speaking of work, I have a lot to do today.
