题目列表(包括答案和解析)
the chair is very comfortable to sit on该句中的不定式与主语有动宾关系，因此必须是及物动词，不及物动词则该加上适当的介词。
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
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________。
非谓语动词：动词不定式、动名词、现在与过去分词与独立主格结构作主语、宾语、表语、宾语补足语与状语
1. I think it wrong ________ our advice.
A) for him not to take B) of him not to take
C) of him not taking D) for him not taking
将下面的简单句合并成一个复合句(并列句，定语从句，非谓语动词和状语从句)
You can leave for Shanghai by train．You can leave for Shanghai by plane．
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