英语书用英语怎么诰，叫做"write a book in Engpsh"。其中"write" 是动词，意思是写作，"book" 是名词，意思是书籍，"in" 是介词，意思是在...里面，"Engpsh" 是名词，意思是英语。
例句：
I'm going to write a book in Engpsh. (我要写一本英语书。)
He has written several books in Engpsh. (他已经写了几本英语书。)
She is currently writing a book in Engpsh. (她现在正在写一本英语书。)
这个短语的来源是英语是一种语言，写书是一种活动，由于英语是一种语言，所以人们用英语来写书，这样就有了这个短语。