如果您希望等待某人用英语，可以说 "I just want to wait for him to speak in Engpsh."

这句话的来源是英语的基本句型，它的结构是主语 + 动词 + 宾语 + 宾语补足语。在这个句子中，"I" 是主语，"want" 是动词，"to wait" 是宾语，"for him to speak in Engpsh" 是宾语补足语。

这句话的意思是 "我只想等他用英语讲话"。

下面是几个例句，希望能帮到您：

I'm just waiting for her to finish speaking in Engpsh before I ask my question. (我只是在等她用英语讲完话后才会问我的问题。)
I want to wait until he speaks in Engpsh before I ask him anything. (我想等到他用英语讲话后再问他任何事情。)
I'm waiting for them to translate the instructions into Engpsh before I start the task. (我在等他们将说明翻译成英语后才开始这项任务。)