摘要：2．作定语的不及物动词分词形式为:V –ing 和过去分词.V –ing 表示正在进行,过去分词表示已经完成.如: falling leaves 正落的叶子 fallen leaves 落下的叶子 boiling water 正沸腾的水 boiled water 沸腾过的水
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1)Police said the accident occurred about 4∶30 p.m．
2)This small tree also occurs in central and southern India．
3)The though of giving up never occurred to me．
occur为不及物动词，“to happen, especially unexpectedly”，如上面例句中的________；“come into sb's mind suddenly”，如上面例句中的________；“to exist or be found somewhere”，如上面例句中的________。
动词的分类：行为/实义动词、及物与不及物动词、瞬时与持续动词、状态与动作动词、 助动词、情态动词与连系动词
1. There is someone knocking at/on the door. Who ________ it be?
A) may B) will C) can D) must
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