Unit 1 Helping those in need第 3 课时——语法课后拓展课时精讲栏目导航课时过关单元语法讲解：动词不定式（Infinitives） 1．不定式的基本形式: to＋动词原形,有时可以省略 to。 2．动词不定式的特点: （1）没有人称和数的变化,在句子中不能作谓语。 （2）动词不定式仍保留动词的特点,可以有自己的宾语和状语。动词不定式同它的宾语或状语可构成动词不定式短语。如: to read a book; to sing at the party。 （3）动词不定式具有名词、形容词和副词的特征，因此，在句中可以作主语、表语、宾语、宾语补足语、定语和状语。 3．动词不定式作宾语：即不定式直接跟在谓语动词后,是谓语动词涉及的直接对象。如果没有这个不定式,这个句子的意思就让人难以理解。能直接带不定式作宾语的及物动词主要有: want, like, love, need, try, ask, learn, begin, start, forget, remember, hope, wish, agree, choose, fail, refuse, decide, afford, offer, plan, hate, arrange 等。如： My mother agrees to buy a pair of sports shoes for me. 我妈妈同意给我买双运动鞋。 We decide to have a party. 我们决定举行一个晚会。 She hopes to be an engineer. 她希望成为一名工程师。 As the lights turned green, all the cars started to go. 当灯变绿时，所有的车开始走了。 Sorry, I forgot to tell you about the news. 对不起，我忘了告诉你这个消息。 Tom remembered to leave the keys on the desk. 汤姆记得把钥匙放在桌上了。 Mr Liu is arranging to have an English Speaking Competition. 刘先生正在安排举办一场英语演讲比赛。 The shopkeeper refused to receive the broken handbag. 保安拒绝收下破了的手袋。 Mary hates to climb mountains. 玛丽不喜欢爬山。 My father offers to pick us up. 父亲提出接我们。 4．动词不定式作宾语补足语: 能用动词不定式作宾语补足语的动词有: ask, tell, get, order, would like, want, teach, show, allow, encourage, warn, wish, invite, help 等。如： She often invites us to take part in her party. 她常邀请我们参加她的晚会。 Mom always tells me to go home on time. 妈妈总是叫我按时回家。 O...
