老虎的外貌特征: big,beautiful,strong,powerful, heavy 老虎的行为动作: catch,move,dash,leap,walk,hunt, kill, eat,scratch, rub, play, chase, pounce, jump, climb 老虎的身体结构: fur, coat, tooth,eye,paw, tail,leg,whisker 与老虎的生活习性有关的词: hunter,carnivore,swimmer,alone 与老虎的生活环境有关的词: forest,water,hot place,cold place spend sth.doing sth.花(时间)做某事 check out...查看.....; 调查...... cut down 砍倒 bein trouble 有麻烦 be able to do sth.能够做某事 状语从句中主谓成分的省略: Along tail helps a tiger keep its balancewhen moving quickly. 疑问词加动词不定式作宾语: They are learning how to be goodhunters. 倒装句: When forests disappear, so do tigers.让步状语从句: Though tigers are in trouble, there is good news地点状语从句: People are planting trees where forests have beencut down.