以下四道题目是历年考过的句子作用题，由于句子作用题题目有限，所以除过黑体字部分外的，把其他的句子也做了一下分析，希望对同学做此类题目有所帮助。

1. The use of nets at beach resorts to protect swimming areas from sharks has been criticized by environmentalists because the nets needlessly kill thousands of marine animals annually.(finding)However, environmentalists have recently discovered that an electrified cable buried beneath the periphery of swimming areas causes sharks to swim away while harming neither humans nor marine life. Hence by installing such cables, resort communities.(premise)Will be able to maintain tourism while satisfying environmentalists’ concerns.(conclusion)

2. Hunters alone are blamed for the decline in Green rock National Forest’s deer population over the ten years.(finding)At CLEARLY black bears have also played an important role in this decline. (conclusion) In the past ten years, the forest’s protected black bear population has risen sharply, and examination of black bears found dead in the forest during the deer hunting season showed that a number of them had recently fed on deer.(evidence)

3. Last year a record number of new manufacturing jobs were created. (finding) Will this year bring another record?(question) Well, any new manufacturing job is created either within an existing company or by the start-up of a new company.( obvious truth on which the argument is based) Within existing firms, new jobs have been created this year at well below last year’s record pace. (evidence)At the same time, there is considerable evidence that the number of new companies staring up this year will be no higher than it was last year and there is no reason to think that the new companies staring up this year will create more jobs per company than did last year’s start-ups.( a judgment advanced in support of the main conclusion of the argument) So clearly, the number of new jobs created this year will fall short of last year’s record. (main conclusion)

4. In countries where automobile insurance includes compensation for whiplash injuries sustained in automobile accidents, reports of having suffered such injuries are twice as frequent as they are in countries where whiplash is not covered.( a finding whose implications ale at issue in the argument) Some commentators have argued, correctly, that since there is presently no objective test for whiplash(evidence), spurious report of whiplash injuries cannot be readily identified.( intermediate conclusion that has been used to support a conclusion that the argument criticizes.) These commentators are, however, wrong to draw the further conclusion that in the countries with the higher rates of reported whiplash injuries, half of the reported cases are spurious(judgement) clearly, in countries where automobile insurance does not include compensation for whiplash, people of have little incentive to report whiplash injuries hat they actually have suffered. (main conclusion)