Which are proper nouns, and which are common nouns?
<p>PROPER NOUNS WHAT ARE THEY? HOW DO WE USE THEM? Which are proper nouns, and which are common nouns? Sometimes you'll see "earth" capitalized when it's listed with all the other planet names or when it's referred to in an astronomical way. For example, it will likely be capitalized in a sentence about space travel like, We plan to leave Earth in January and arrive at Mars in October, but it is likely to be lowercase in a sentence where it is used more generically, like, I'm wishing for peace on earth and goodwill to men. So the word earth is an exception to the rule that something is always a proper noun and capitalised if it names one specific place. Planet Earth or planet earth? PROPER NOUN OR COMMON NOUN? </p>