Hi Danyel, We "demand" when we are asking for something in a firm and resolute manner. When we demand, we are unlikely to accept "no" as an answer. Example: After being stranded at the airport for two days due to heavy snow, many travellers are demanding for compensation. We make a "claim" when we are declaring something because we think it is the truth or a fact. However, it may or may not be a fact or truth. Example: The defendant claims that the plaintiff was the one who instigated a fight. When we have a need for something, we "require" it. We call that thing a "requirement". Example: We require more information about the flight status. Hope this helps. Cheers, Lance

Claim means to either state that something is (or isn't) true, or to ask for repayment for money that you have to spend (for example if you had to spend money whilst on business for your company). To demand is to insist that somebody does something. "I demand that you answer my question right now." To require is a verb that is more often used (I would say) in the first person - when you are talking about yourself.. "I will require assistance with this piece of work," = which means that you will need assistance with this piece of work. You can also use the verb "to require," when addressing other people ... here the meaning is more like the verb "to demand," but I would say that this is an old-fashioned way of speaking: "I require you to work harder." This would be very old-fashioned - we would use the word "need," instead of require.

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Demand is used to purchase something while claim is used to be owner of something