在英语中，"安静看书"可以用下列表达法表示：

Quietly reading a book
Reading a book quietly
Engrossed in a book

其中，"quietly" 是形容词，意思是"安静地"；"reading" 是动词，意思是"看书"。"Engrossed" 是形容词，意思是"全神贯注的"，也可以用来表示"安静看书"的意思。

例句：

She sat quietly reading a book by the window. (她坐在窗边安静地看着一本书。)
He was reading a book quietly in his room. (他在房间里安静地看书。)
She was engrossed in a book and didn't notice anyone coming in. (她全神贯注地看书，没有注意到有人进来。)