When the relative pronoun is the object of a preposition, which is used instead of that, for example,  in which ,  for which ,  about which ,  through which , etc. (please see the third example below): Formal English: This is the man to whom I wanted to speak and whose name I had forgotten.he relative pronoun that can only be used in restrictive clauses. It can also be substituted for who (referring to persons) or which (referring to things) in informal English. Whereas that is often used while speaking, who and which are more common in formal written English.
For other uses, see Yellowstone (disambiguation). Yellowstone National Park is a national park located in the U.S. states of Wyoming, Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone was the first National Park in the U.S. and is also widely held to be the first national park in the world.
Since 1997. Mt Haynes and the Madison River. Yellowstone National Park is located in the northwest corner of Wyoming, and includes small areas of Montana and Idaho as well. In addition to its superb Rocky Mountain scenery, the park is one of the worldâs principal wildlife preserves.Itâs also the site of Americaâs greatest concentration of geysers and hot springs, which form a visible and spectacular link with the primeval forces of the Earthâs creation.n addition to its superb Rocky Mountain scenery, the park is one of the worldâs principal wildlife preserves. Itâs also the site of Americaâs greatest concentration of geysers and hot springs, which form a visible and spectacular link with the primeval forces of the Earthâs creation.