come up 走近；被提出

come about 发生

come across遇见 be absorbed in专心于

concentrate on集中精力于

apply oneself to致力于

背教材原句 记句式结构 仿写促落实 1.In this perfect world lived people who had discovered how to stay young forever.

住在这个完美世界里的人们知道如何永葆青春。 介词短语置于句首，句子要倒装。 Under the tree sat an old lady with a cat lying on her legs.

树下坐着一位老太太，腿上趴着一只猫。 2.Nature has provided Shangri­la with endless natural treasures，making the land a happy home for the local people.

大自然为香格里拉提供了无穷无尽的天然宝藏，使得这片土地成为当地人的幸福家园。 making the land...为现在分词短语作结果状语，表示意料之中，自然而然的结果。 Her husband died ten years ago，leaving her with three children to look after.

她丈夫十年前去世了，撇给她三个需要照看的孩子。