高分请各位高手速速帮忙。work at、work out、work on区别...

work on sth.就有“直接平面接触”地作用于宾语，具体地改变宾语的状态的意思；

而work at sth.就没有那么具体直接，它只表示“点存在”，
work at 从事，致力于……

work for 为……做事，为……尽力，被……雇佣者

work out 可以解决，设计出，算出，计算出，消耗完
挤出去

work in 引进，配合

work as 作为....的工作
i work the butter in the flour
i work at biology
i work as a management for a design company
i work on my news article all night
i work with my groups
can you work the bill out?
My brother works on writing.
I worked out this math problom at last.

in the bed是指在被窝里,
而ON THE BED就是指客观的"在床上",比如把一个帽子放在床上,就用这个词组.
in the bed 睡着了，或者是躺在床上,特别是在床上呆了一阵子了。（因为英英字典的解释是：after a very lengthy period of time）
in bed尤指在行房过程中或者在床上做事的过程中。比如：He performs well in bed. 又如：Jack and Jane had breakfast in bed.

prefer to do rather than (to) do “宁愿……而不……”
She preferred to go with us rather than stay behind.他宁愿和我们一道去，而不愿留下。
prefer A to B (= like A be