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
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