what past participle of agree

agreed

You can always find out lots of things about a word by looking it up. I went to http://www.dictionary.com and entered "agree" --

http://dictionary.reference.com/browse/agree?s=t

~ You can see it used in a sentence.
~ You can learn its origin.
~ You can hear it pronounced.
~ You can see how its other parts of speech are spelled. (When the past tense is included only once, then you know that the verb's second and third principal parts are identical, in this case "agreed.")
~ You can read about its different meanings (if there are more than one).