speak in Chinese用汉语说 speak 是 不及物动词
speak Chinese说汉语,speak 是及物动词但我觉得还是差不多的说。。那考试时什么情况用in什么时候不用呢？能稍作解释吗，或者举几个反差较大的例子也可以。谢谢I don't understand Japanese.Please speak in Chinese.我不懂日语，请用汉语说。He could speak Chinese before he came to China.他来中国以前就会说汉语了。 希望能帮到你，祝你开心