When you use long quotations, you are giving up space in your essay to someone else, almost as if a guest speaker has entered your paper and is temporarily pushing you aside.
The simple answer is "seldom," but there are specific situations in which you should use an ellipsis in this way. You should use an ellipsis if the words you quote, as they appear in your essay, constitute a complete sentence, but, in the original, the words you quote are only part of a longer sentence. We can use a simple example to demonstrate the idea. Let's say the original is "I am here, and I am ready." Here's how I could quote the sentence or part of it.
how to put long quotes in an essay - Marilyn Lazala & ASOCS
If you cite from the same author in the very next citation youdo not have to put the authors last name in the in line citation,just the page number.Example:
How much higher skyscrapers of the future will risethan worlds tallest building, the Sears Tower, is unknown.