请问老师，关于不定式作定语，是不是用先行词的存在与否能否决定动作的发生会更妥当些？
如：We have a plan to learn from Jack.，因为有了计划，所以要去学习；I have many letters to write.因为信存在，所以要写；还有OG2016-SC-49的D选项，executive announced plans to reduce debt，因为计划存在，所以要削减成本。
上述句子如果用主句的发生与否是否会影响do的发生的话，主句的核心词是谓语动词，所以等同于谓语动词的发生与否是否会影响do，上面的have/announce都是控制力弱的动词，不能影响后面的do。
同时，因为to do作定语时实际是没有逻辑主语的，关于to do在一个句子里到底作的是定语还是作状语，也是通过谓语动词能否影响do来区分的。比如We have some letters to write.里have不能影响write，to do作定语；She arrived early to get a good seat.里，arrive early能影响get a good seat，to do作状语。
不知道理解得对不对，请教下毕老师。
Krech also contradicts Martin's exclusion of climatic change as an explanation by asserting that widespread climatic change did indeed occur at the end of the Pleistocene
M的理论排除了天气作为动物灭绝的原因
White observes that Martin's thesis depends on coinciding dates for the arrival of humans and the decline of large animal species, and Krech, though aware that the dates are controversial, does not challenge them
M的理论中特定选取了人类到达和动物灭绝巧合的时间点，K尽管意识到了但没有公然挑战这些时间。-> 高亮部分是为了支持W对M，K的challenge
suggests a much earlier emergence of complex life-forms VS suggests that complex life-forms emerged much earlier
名词表示物品和把事情物品化，这件事情是可以看到时间终点；动词指事情在进行，不带时间终点的属性。某物出现得更早这件事情是一个类似于真理的惯常的性质，不具有时间概念，比显示了一个出现、把它框定成一个物品要好。
E，an earlier emergence than emergence previously thought，an earlier A than B，错误，可以说 A man is elder than me， 但是我们不能说 A elder man is than me，
Noble fails to substantiate this claim, although his argument is impressive when he applies the Marxist concept of "de-skilling"—the use of technology to replace skilled the automation of the machine-tool industry
impressive 代表作者对Noble的正面态度
In Forces of Production, David Noble examines the transformation of the machine-tool industry as the industry moved from reliance on skilled artisans to automation
unlike N/C, its programs were produced not by engineers at their computers, but by skilled machinists, who recorded their own movements to "teach" machines to duplicate those movements
But equally important to Hopi cultural persistence may have been an inherent flexibility in their social system ...
补充新的evidence解释Hopi society stable的原因
前面有not，后面要表示否定用nor，不用or，比如：with none of A or B=with none of A or with B，不能表示B也没有
neither... nor... | not... nor...的用法都是可以的，如：He wasn't there on Monday. Nor on Tuesday, for that matter.及‘I'm not going.’ ‘Nor am I.’
without A or B=without A or without B，ok
Anthropologists studying the Hopi people of the southwestern United States often characterize Hopi society between 1680 and 1880 as surprisingly stable
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对A不太理解。感觉如果不是所有裁缝都要去那个学校，那么那三个人里不管穷富都有可能不是E的爸爸... 所以觉得这个也断掉了因果联系。这么想为什么不对呢？