Following is the article extracted from antropological text book.
We. all know waht culture is. Or do we? Can you define culture? If you can't, don't worry. You're in good company. For the entire history of anthropology, a continual project has been to try to come up with just such a definition. One reason for the difficulty is simply that the phenomenon of culture is so complex. The second reason is that, until recently, we were trying to define culture in a way that made it our species' unique possession.
If above red-colored thing was substituted with "have been trying to", how would it sound like, comparing the original one.