How to use the word “为”？ I have noticed that 为 has so many uses. ex. to smthg as; to act as; to become; to serve; to behave; to act; to be; to do; by (passive voice); for; to ***Please help me identify the use of 为 in these following sentences. Please feel free to add additional sentences. My understanding of the use is still limited and confused. 1。 我们一定要为您见义勇为的事迹报功。 We will definitely report your heroic deed to a higher authority. 2。身为家庭主妇，每天都要为一些家事操神。 A housewife has to worry about a lot of housework. 3。“天下为公”是为大道也。 "The whole world as one community" is a way of virtue and justice. 4。攥着刀把儿，你也不能为所欲为。 Even though you are in power, you can't just do whatever you want. 5。正所谓“人为刀俎，我为鱼肉”，现在只能任人摆布了。 Just as a Chinese saying goes, "being meat or fish on another's chopping board", I am now at others' mercy. 6. 当水平夹角为零时，垂直夹角也为零。 When the intersection angle at the horizontal level equals zero, the angle in the vertical direction is also zero. *** How do I know the difference between 为and other characters like 到／被／ etc。