speak跟make a speech的区别？

speak是说话的意思，而，一个动词，而make a speech是做演讲的意思，区别可以从以下例子看出：

I know you like to speak in the public, please help us to make a speech next celebration of our anniversary. 我知道你喜欢在公众场合讲话，请帮助我们在下一次庆祝周年纪念时发表演讲。