题目内容
4．She has already seen the book．（变为否定句）Shehasn't seen the bookyet．
分析 她已经看过这本书了．
她还没有看过这本书．
解答 答案：hasn't；yet 分析原句，原句是一个现在完成时的陈述句，变否定句时在has后面加否定词not，即hasn't，already通常用于肯定句，变否定句时要改为yet，故得出答案．
点评 现在完成时表示过去发生或已经完成的动作对现在造成的影响或结果，也可表示过去已经开始，一直延续到现在的动作或状态．学习现在完成时，先从结构和句式开始：
构成：主语+have/has+过去分词+其他（当主语是第三人称单数时用has，其余人称用have．过去分词：规则动词的过去分词构成与动词过去式相同；不规则动词需要特殊记忆．）
否定式：主语+haven't/hasn't+过去分词+其他
疑问式：Have/Has+主语+过去分词+其他？
简略答语：Yes，主语+have/has．（肯定）
No，主语+haven't/hasn't．（否定
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| quickly，while，clear，meter，walk，across，both，careful，wait，understand |
A car，a truck or a bus cannot stop very （68）quickly．If it's running very fast，it will travel many meters before it stops．People don't always （69）understand this．They think a car can stop in a few （70）meters．The faster a car traveling，the longer it takes to stop．
The only safe way to cross the road is to look （71）both ways，right and left．Then if the road is （72）clearit is safe to cross．The right way to cross is to （73）walk quickly．It's dangerous to run．If people run （74）acrossthe road，they may fall down．
Besides，we can't cross the road when the traffic light is red．We must （75）wait till the light is green．If old people have trouble in crossing the road，young ones should try their best to help them．
12．-What's____QQ number？
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-____QQ number is 969798112．（ ）
| A． | you； I | B． | your； My | C． | her； His |
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| A． | I don't | B． | I'm not | C． | he isn't． |
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A：Of course!（58）D
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