求助英语好的同学!我找不到主语等各成分是什么...1,in reaction to the backward discharge of bullets,the gun,and hence the boat,move forwards.2,cylindrical in shape,made of wood,and hanging from string,it was moved to and fro bu steam blowing out from samll exhaust ports at either end.第二句打错了 应该是by～cylindrical in shape,made of wood,and hanging from string,it was moved to and fro by steam blowing out from samll exhaust ports at either end.

1，（in reaction to the backward discharge of bullets,the gun, and hence the boat 原因状语从句）, （此处省略主语）（move 谓语） forwards（谓语补足语）.
2, （cylindrical in shape, made of wood, and hanging from string 作为it的定语）, （it主语） （was moved 谓语） to and fro bu steam blowing out from samll exhaust ports at either end.

1主the gun, and hence the boat 谓move forwards 状in reaction to the backward discharge of bullets

1,in reaction to the backward discharge of bullets,状语.the gun,and hence the boat,主语 move谓语 forwards.状语
2.by～cylindrical in shape,made of wood,and hanging from string都是状语,it 是主语was moved是谓语 to and fro by steam blowing out from samll exhaust ports at either end.都是状语

1 由于向后发射的子弹有反作用力，导致那把枪和船都向前移动。主要意思就是枪和船向前移动。
2 这句打错了吧，仔细检查一下