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Why not __ your teacher for help when you can’t finish ___ it by yourself?

A. ask; write B. to ask; writing

C. ask; writing D. asking; write

C

【解析】

试题分析:句意:当你不能自己完成时,为什么不向老师寻求帮助呢?Why not+动词原形;finish doing干完某事。结合句意,故选C

考点:考查固定句式及非谓语动词用法。

考点分析: 考点1:非谓语动词 非谓语动词:在句子不作谓语使用的动词,其形式有不定式、现在分词、动名词和过去分词四种(通常我们把现在分词和动名词统称为-ing分词)。  非谓语动词短语:非谓语动词仍保留动词的性质,可以有自己的宾语、表语或状语,我们将非谓语动词和其宾语、表语或状语一起称作非谓语动词短语。  非谓语动词的判定方法:考虑句中谓语动词以及其它词语同非谓语动词的关系和对非谓语动词形式的限制,以便选用正确的非谓语动词形式。   非谓语动词判定的基本步骤: ①是否应用-ing分词  ② 是否应用不带to的不定式  ③ -ing分词还是不定式 ④-ing分词还是过去分词  ⑤ 不定式的用法  一、是否应用-ing分词: 下列情况必须用-ing分词  1、在下列动词(短语)之后作宾语或宾补时; 2、在介词之后作宾语时; 3、作句子主语位于句首时;  4. 位于限定词后作名词使用时;、 5、在“go + -ing形式(运动名称)”和“ do some + -ing形式”这类固定短语中。   We will go fishing if it doesn’t rain tomorrow.       She did some shopping last Sunday.   6. –ing分词前逻辑主语的使用:有时我们需要在-ing分词前加上其动作的发出者(逻辑主语),其动作的发出者用名词所有格或形容词性物主代词表示。 二、是否应用不带to的不定式:  下列情况必须使用不带to的不定式  1、位于情态动词后同情态动词一起作谓语时;  2、位于would rather , had better , why (not)之后的不定式; 3、位于感官动词和使役动词后作宾补的不定式(注:help之后作宾补的不定式可以带to也可不带to); 4、两个不定式由and , or , except , but 或 than连接在一起时,第二个不定式常常不带to。  三、-ing分词还是不定式:   1、动词like之后,使用不定式主要说明一次性的动作;使用-ing分词主要说明存在的状况。  2、begin和start之后,-ing分词和不定式都可使用,但如果begin/start自身为-ing分词时,之后通常用不定式。  3、stop、remember、forget和go on之后的非谓语动词形式的判定,主要应考虑非谓语动词的动作在谓语动词动作前是否已发生:如动作发生在谓语动词的动作前,用-ing形式;如动作发生在谓语动词的动作后,用不定式。 4、need之后的非谓语动词形式的判定,主要考虑句子的主语同非谓语动词的关系:如句子的主语为非谓语动词的逻辑主语,用不定式;如句子的主语为非谓语动词的逻辑宾语,用-ing形式。 5. 感官动词后的非谓语动词形式的判定,主要应考虑是说明整个动作(不带to的不定式),还是说明动作的一部分(-ing形式)。主要有下面几种情况:  (1)句子中有表频率的词时,用不带to的不定式;  (2)look at以及see和hear的过去式后,一般用-ing形式; (3)watch之后,一般用不带to的不定式。 四、-ing分词还是过去分词:   1. 表伴随的插入语中的非谓语动词形式的判定,主要应考虑句子的主语同非谓语动词的关系:如句子的主语为非谓语动词的逻辑主语,用-ing形式;如句子的主语为非谓语动词的逻辑宾语,用过去分词。  2. call和name位于名词后,其后带上人名、书名等词语时,用过去分词。 3. there be句中位于名词后的非谓语动词,如名词相当于动作发出者(主动式),非谓语动词用-ing分词,如名词为动作承受者(被动式),非谓语动词用过去分词。 五、不定式的用法(非上述四种情况时,非谓语动词一般都使用带to的不定式):  1.不定式的否定形式:在不定式的小品词to前加否定词not。 2. 先行词it的使用:当不定式做句子的主语时或做句子的宾语其后带有宾补时,为保持句子结构的平衡,通常将不定式放在句子末尾,而在原主语或宾语的位置上加上先行词it。 3.  “wh-词+不定式”的用法:wh-词(特殊凝问词)同不定式连用相当于一个wh-词所引导的一个宾语从句,使用时应注意以下原则: ①如wh-词为凝问代词(what、which、who、whom或whose)时,不定式动词应为及物动词,但不带宾语(wh-词相当于不定式动词的宾语) ②如wh-词为凝问副词(how、when、where等)时,不定式短语中不能再出现表示相同关系的词语;另:如不定式动词为及物动词时,其后必须带上宾语。   ③如wh-词为连词whether时,不定式短语中应有表示选择的部分,否则不定式短语应用or not结尾。 4. 不定式的逻辑主语:不定式动词仍保留动词的特性,也有自己的主语(不定式动作的发出者),我们将不定式动作的发出者称为不定式的逻辑主语。 5. 不定式的逻辑宾语:有时句子中不定式前的某个词语相当于不定式的宾语,我们将其称为不定式的逻辑宾语,此时不定式的动词应为及物动词或及物动词词组(动词为不及物动词时,应加上适当的介词),但不能再带宾语。 6. 不定式位于名词后作定语:不定式位于名词后作定语使用时应注意考虑名词同不定式的关系。、 ①名词相当于不定式的逻辑主语: ②名词相当于不定式的逻辑宾语:此时不定式的动词应为及物动词或及物动词词组(动词为不及物动词时,应加上适当的介词),但不能再带宾语。 ③名词相当于不定式的状语:此时不定式应以介词结尾(因为名词不能直接作状语,而应在其前加上适当的介词构成介词短语来作状语,说明地点、方式等,所加的介词这时放在不定式后)。
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