for certainとcertainly、他
I was sent to have my eyes tested. He took me into the darkened interior and said, "Sit down, dear." He put his arm round my shoulder. His forefinger moved up and down on my neck. I was thirteen and didn't like to be rude to him. Dorothy Simmonds, his sister, came downstairs just then; she came upon us silently and dressed in a white overall. Before she had crossed the room to switch on a dim light Mr Simmonds removed his arm from my shoulder with such a jerk that I knew for certain he had not placed it there in innocence.
Muriel SparkのThe Dark Glassesからの英文です。
Mr Simmonds removed his arm from my shoulder with such a jerk that I knew for certain he had not placed it there in innocence.のところはsuch~that構文だと思うのですが、
●a jerkはどのように意味をとるとよいですか？
●for certainとcertainlyは同じ意味ですか？
使い方に何か違いはあるのでしょうか？
前文は
At the end of the thirties Leesden End was an L-shaped town. Our house stood near the top of the L. At the other extreme was the market. Mr Simmonds, the oculist, had his shop on the horizontal leg, and he lived there above the shop with his mother and sister. All the other shops in the row were attached to each other, but Mr Simmonds' stood apart, like a real house, with a lane on either side.
となっています。
教えてください。
宜しくお願いします。
お礼
なるほど・・・ありがとうございます。