关于to do作定语/状语

好,

One report concludes that many schools do not have, nor are they likely to have, enough computers to use them effectively.

请问为什么这里use后面要加them呢?这个结构与I have a lot of work to do. 区别在哪里呢?前者是不定式作状语?后者是不定式作定语?

句子来源:GMAT PREP


The comet moves quickly enough for scientists to observe.

请问这个句子正确吗?需要在observe后面加上it吗?这里to observe是什么成分呢?

谢谢的解答!

如题
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1 个回答

简写一下你这句子:many schools do not have?enough computers??to use them effectively.? ? ? 主? ? ? ? ? ? ? ? ? ? ? ? ? ?谓? ? ? ? ? ? 宾? ? ? ? ? ? ? ? ? ? ? ? ?状? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 非谓语? ? 宾? ? ? ? ? 状这里的use作及物动词,后面要接宾语。这里的to use...也是做状语,但不管它是作状语还是定语,这与你问的要不要加them都无关。后面这句,也是一样的道理,这里的observe是作及物动词,所以要加it。例子:It will come around 300 million km (about 186 million miles) closer to the sun in December, giving scientists an opportunity to observe it.
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