题目内容

16．Where's my pencil box？I ______ know．（　　）
A．aren'tB．don'tC．isn'tD．be not

分析 ---我的铅笔盒在哪里？
---我不知道，

解答 答案：B，表达的是客观事实用一般现在时，know是实意动词，主语I，借助于do构成否定，故答案是B．

点评 1． 简单句中含有系动词be、情态动词和助动词时，变否定句时需在系动词be、情态动词和助动词后加not．如：I am a teacher．→I am not a teacher．
He can help me．→?He can't help me．

2．简单句中谓语动词为行为动词时，要根据时态选用do的相应形式，把肯定句变为否定句．如：
The little girl wants to go there．?→The little girl doesn't want to go there．
He did his work yesterday．→?He didn't do his work yesterday．

3．祈使句变否定句时，一般在句首加Don't，但Let us或Let's开头的祈使句在 Let us或 Let's后加not即可．如：
Put them over there．→?Don't put them over there．
Let us go home．→?Let us not go home．

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