求详解英语语法里改写句子中的几种句子的改写方法

虚拟语气（using subjunctive mood）、
He suggested us going out for a walk.
=He suggested that we should go out for a walk.
非限定形式（using a non-finite verbaform）
Tom is a teenage boy and he has run away from his home
=Tom,(who is)a teenage boy,has runaway from his home.
修饰性状语（combining the tow sentenses by using a Adjunct)
Jack sat under a tree.He was reading a book.
=Jack sat under a tree,reading a book.
连接性状语从句（combining the tow sentenses by using a Conjunct)
Tom and his companion are sailing down the river.Suddenly ,they see something ahead in the water.
=Tom and his companion are sailing down the river when they see something ahead in the water.
祝你开心如意!