android点击按钮变色:他们不说英语，这句话对于否定怎么用我有点糊涂。

They speak no english和They don't speak english 应该都是可以的吧。这两句都可以翻做他们不说英语。但是下面一句：They speak not english.是错误的，not一般与助动词如do,have或情态动词will,may,can,must等连用表示否定，而不能单独使用。又比如：
They have no time. They don't have time都表示他们没有时间。而不能说They have not time. Don't 就是do not的缩写形式。
其实学习英语有时并不需要刨根问底，只要理解个大概就行。主要是记忆，背清楚了再做些相关的练习就基本能掌握了。所以我建议你找几个否定的例句相互比较一下，搞清楚词性，再清清楚楚地背起来，做几个习题。这样以后看到否定句就不会糊涂了。
不知道我的建议对你有没有用？

简单点说：They speak no English 是强调否定。他们更本上不会英语。

They don't speak English 确实并不表明他们不懂英语，只是说他们不讲。当然他们也有可能确实不会英语。

比如：

I don't speak Chinese when I am with my boss. He's from Austria, you know.其实我会汉语。

Though their parents are Chinese， but they don't speak Chinese. The nurse who look after them is from Jamaica and they parents encourage them to speak English.

侧重点不同：
They speak no english.
表示他们不说英语，但是不代表他们不会英语。
They don't speak english
表示他们不说英语，大多是因为他们母语不是英语，或者不会说英语。
They speak not english 这句话语法不对。

都可以用啊~两个说法都对啊~
不过语感好象有点不一样.

They don't speak english 我觉得应该是这个