concord

concord (samsvar/kongruens): agreement in grammatical form between elements in a clause or a phrase. The term refers most commonly to the agreement between the form of the subject and the form of a verb in a sentence; namely that if the subject phrase is in the third person singular, a present tense verb must end in -s. E.g. I sing, she sings, we sing. (The verb to be has special forms for other types of subjects too, as well as a distinction between first and third person singular (was) and other subjects (were)).