1.Significant factors to include in the budget when {buying} a car are the costs of fuel and maintenance and the insurance payments.这里的buying是对的。2.Mr Hanson proudly demonstrated his company's latest cellphone,a model that flashes the ti

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1.Significant factors to include in the budget when {buying} a car are the costs of fuel and maintenance and the insurance payments.这里的buying是对的。2.Mr Hanson proudly demonstrated his company's latest cellphone,a model that flashes the ti
1.Significant factors to include in the budget when {buying} a car are the costs of fuel and maintenance and the insurance payments.
这里的buying是对的。
2.Mr Hanson proudly demonstrated his company's latest cellphone,a model that flashes the time in color-coded numerals when {pressing} a button.
这里的pressing是错的,要改成pressed。
第2题,因为主语是model,所以要用pressed被动。
那同理第1题,buying为什么是对的?为什么不是when a car was buyed,所以要用buyed?

1.Significant factors to include in the budget when {buying} a car are the costs of fuel and maintenance and the insurance payments.这里的buying是对的。2.Mr Hanson proudly demonstrated his company's latest cellphone,a model that flashes the ti
我也刚学sat没多久,这俩题看得我蛋疼.不过好像都是悬垂结构,
先说第二题
定语从句主语是model,所以用pressed,为什么?
先考察一下非谓语动词和主语的逻辑关系
a model pressed by a user
a user pressing a model
a model that flashes the time in color-coded numerals when a button pressed by a cellphone user(Mr Hanson)
a cellphone user(Mr Hanson) who flashes a model the time in color-coded numerals when pressing a button
明白了么?press和model有逻辑关系.
但这道题的答案并不是pressed,因为整个句子的主语是Mr hanson,press button的动作从理论上讲只能是Mr hanson发出的,但如果你用he pressed a button或者a button pressed by him就会和主句的谓语动词demonstrated 从时态上产生冲突和混乱. 所以正确的答案是one presses
但是当非谓语动词与主语无任何逻辑关系的时候,有时这种句子依然正确,书上说这些都是固定搭配,特别是出现在一些表示说话人态度的结构中.这点你要记好
比如:
Generally speaking ,women live longer than men.
speaking和woman没啥关系,只跟说这句话的“我”有关系
同理
Judging from his accent,he must be from Northern China.
这些结构大多都是动词ing,书上也都是这样的例子,因为我们的态度大多都是主动.比如你说的第一题也是如此,不能用bought,因为作为一个buyer你不能说当一辆车被bought的时候那些重要的因素to include在预算里.
当然如果你非要用过去分词那也一定是站在卖家的立场上说这句话,
那应该是
Significant factors to (be included) in the (proceeds收益) when (sold) a car are,
但原句用了to include,做了限定,所以这里要用主动buying,既你只能站在买家的立场上,当然用动词原型buy一样可以,但前面要有名词you
明白了吗?
不明白就追问
如果没有问题,小弟最近手头紧,呵呵,能多赏个20分么?呵呵

Significant factors to include in the budget when (people) buying a car are the costs of fuel and maintenance and the insurance payments.

第一题:when ___(buy) a car,这个句子里,没有主语,只有谓语buy和宾语a car,那么这个句子的主语是谁呢?不可能是a car了啊(它已经是宾语了),所以这个主语应该是指某个人。when (sb)___(buy)a car.主语和buy之间的关系是主动的,所以用主动形式。这里buying是动词ing形式做时间状语,其实是把主语省略掉了,还原回来:when sb is buyin...

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第一题:when ___(buy) a car,这个句子里,没有主语,只有谓语buy和宾语a car,那么这个句子的主语是谁呢?不可能是a car了啊(它已经是宾语了),所以这个主语应该是指某个人。when (sb)___(buy)a car.主语和buy之间的关系是主动的,所以用主动形式。这里buying是动词ing形式做时间状语,其实是把主语省略掉了,还原回来:when sb is buying a car.
提醒楼主一点:buy的过去式和过去分词都是:bought而不是buyed,记住咯。
第二题: when _____(press) a button这个句子的主语同样的也没有出现,但是前面的句子: a model that......(定语从句)间接的告诉了我们press的主语是model,对于model来说,press这个动作是被动的,是人来按按钮的。

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因为第一题buy的主语是人,所以用主动,是buying
第二题press的主语是物,所以用被动
这种题遇得多自然就懂了
一通百通

第一句用buying
when sb buys a car 是这个时间状语从句改成的非谓语动词。谓语是主动形式,改成了ING形式。
第二句我理解pressing是对的。一样的是when sb pressed a button的变形。
不过,如果换成when a button was pressed ,那么原句就要换成:when a button pressed.这样也对。...

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第一句用buying
when sb buys a car 是这个时间状语从句改成的非谓语动词。谓语是主动形式,改成了ING形式。
第二句我理解pressing是对的。一样的是when sb pressed a button的变形。
不过,如果换成when a button was pressed ,那么原句就要换成:when a button pressed.这样也对。

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buying a car的主语当然是人啊,人买车,指的是购车的人,