I often see the following exchange on Internet forums:
A: (some proposition)
B: Agreed.
Why "agreed", not "agree"? Is it a contracted form of "have agreed" or the past simple? Is the form "agree" (I agree with you) acceptable too?
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Sign up to join this communityIf you look up agreed in the Cambridge Dictionary, you will see that it is an adjective meaning accepted. If a person says an adjective on its own, it can mean something like "I am.." or "It is...". The omission of these words is an example of conversational deletion.
Doctor: How are you feeling?
Patient: [I am] Hungry!Parent: How are you getting on with your homework?
Child: [It is] Done.
In this case, agreed on its own means "It is accepted".
agree is the verb form. If you use a verb on its own, it is an imperative: telling somebody to do something. So, if you simply say agree, you are telling the other person to agree with you.