Verbal agreement
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In linguistics, verbal agreement is a morpho-syntactic construct in which properties of the subject and/or objects of a verb are indicated by the verb form. Verbs are then said to agree with their subjects (resp. objects).
Many English verbs exhibit subject agreement of the following sort: whereas I go, you go, we go, they go are all grammatical in standard English, she go is not. Instead, a special form of the verb to go has to be used to produce she goes. On the other hand I goes, you goes etc. are not grammatical in standard English. (Things are different in some English dialects that lack agreement.) A few English verbs have no special forms that indicate subject agreement (I may, you may, she may), and the verb to be has an additional form am that can only be used with the pronoun I as the subject.
Verbs in written French exhibit a richer agreement morphology than English verbs: je suis (I am), tu es (you are), elle est (she is), nous sommes (we are), vous etes (you all are), ils sont (they are). Historically, English used to have a similar verbal paradigm. Some historic verb forms are used by Shakespeare as slightly archaic or more formal variants (I do, thou dost, she doth, typically used by nobility) of the modern forms.
Some languages with verbal agreement can leave certain subjects implicit when the subject is fully determined by the verb form. In Spanish, for instance, certain subject pronouns do not need to be explicitly present, even though in French, its close relative, they are obligatory. The Spanish equivalent to the French je suis (I am) is soy (am). The pronoun yo (I) in the explicit form yo soy is only required for emphasis and contrast.
Some languages have a richer agreement system in which verbs also agree with some or all of their objects. Ubykh exhibits verbal agreement for the subject, direct object, indirect object, benefactive and ablative objects (a.w3.s.xe.n.t'u.n, you gave it to him for me).
Basque can show agreement not only for subject, direct object and indirect object, but it also on occasion exhibits agreement for the listener as the implicit benefactor: autoa digute means he brought the car (neutral agreement for listener), but autoa zigunate means he brought the car (agreement for female singular listener).
Languages with a rich agreement morphology facilitate relatively free word order without leading to increased ambiguity. The canonical word order in Basque is Subject-Object-Verb. However, all permutations of subject verb and object are permitted as well.