Free English Lessons from the ESL Resource Center

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What is wrong with the words green and house? There is nothing wrong with the words themselves, but the writer is not discussing a house that happens to be green. He is referring to a special kind of building in which plants are grown, and that buiding is called a greenhouse. It is one word. A reader thinking that a green house is being discussed rather than a greenhouse would be confused. This is not a serious mistake, but fixing it will certainly improve the paragraph.