The dog bit him on his leg when he passed by.his 为何改the

触及身体某一部位的表达方式:
在汉语中,把被触及身体某一部位作为动词的宾语,如：打他的脸；拍她的头.
在英语中,则把接受动作的人作为宾语,用介词短语来说明接触到的身体某一部位,即用下面的句式
主语谓语somebody 介词the身体部位
约翰打了他的脸.
误：John hit his face .正：John hit him in the face
解析：在这一句型中常用的 动词有：hit ,pat ,beat ,touch ,strike 等等.
关于介词的选用问题：
一般身体部位比较硬而突出的地方或强调接触人体的表面,用介词on；如on the head（back ,nose ,shoulder,chest,……）
一般在软而凹的部位用介词 in 如:in the face(eye ,stomach ,rib…..)
一般表示抓,拉,握,牵等.常见动词:catch ,seize ,grab ,pull ,take,hold ,.身体的某一部位时,用介词by.
选择填空:1 The boss_____him _____back and told him something secret Key (D)
A patted….by the B patted …on his C patted…in the D patted …on the
2 Mary led a granny_____hand to across the street Key(D)
A in..the B on the C by her D by the
3 He felt someone ____ him on ____shoulder when he was watching the game.KEY ( C)
A patted…his B pat..his C patting…the D patted….his