Meanings of Tell and Say The meanings of these two verbs, tell and say , are similar. " However, there are some clear and easy rules to follow about when to use these two words, as shown below. Usage rules for Tell and Say Tell is used only to instruct or inform, and when the receiver of the information is included as an object of the verb.
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mirmohamad"They say that you should drink eight glasses of water a day", i suppose this is an instruction for me to how should i use water during a dayI would say it's not quite a direct instruction or command.