To speak English well,a lot of practice is needed.

这句子应该是对的吧.前面的不定式作状语.后面 a lot of practice 作主语 is 作谓语 needed作宾语

学好英语需要大量练习
lots of practice is require in order to speak well in English

need
要学好英语,大量的练习是必需的.

为了说好英语,大量的实践是必要的!
But,as well as the skill of writing

学好英语需要大量练习

A lot of practice is needed for speaking English well。