This is where PRO comes in to help satisfy theta-criterion by appearing as the null subject attaining the appropriate theta role . Below is an example containing PRO in a sentence: (5) a. Jeani is likely [ti to leave]. b. Jean is reluctant [PRO to leave]. Example (5a) is a raising sentence, and in contrast, (5b) is a control sentence, meaning it does not involve any DP movement. The PRO, which is a "null DP" is in the subject position of the embedded clause. (6) a. Jean wants Briani [ti to leave]. b. Jean persuaded Brian [PRO to leave]. Similarly, example (6a) is a raising-to-object sentence; "Brian" raises to the object position of the verb want. In contrast, (6b) is an object control sentence. The verb persuade has three theta-roles to assign: "agent" to Jean, "theme" to Brian, and "proposition" to the clause [PRO to leave]. There is no raising, but there is a PRO in the subject position of the embedded clause that takes the verb leave's only theta-role, "agent". Since Brian does not receive theta-role from leave, it only bears one theta-role, nor does PRO receive a second theta-role from persuade. Every argument only receives one theta-role, and every theta-role of the two predicates is assigned to only one argument. The sentence is thus grammatical. pro pro, also known as little pro, is an empty category that occurs in a subject or object position of a finite clause (finite clauses must contain a verb which shows tense) in languages like Italian, Spanish, Portuguese, Chinese, and some Arabic dialects (; ). pro differs from PRO in that it contains case. The meaning of pro is determined not by its antecedent but by verb agreement in the sentence. The DP is 'dropped' from a sentence if its reference can be recovered from the context. For example: The verb restituire 'give back' assigns three theta-roles, but there are only two overt arguments in the sentence. It ultimately satisfies theta-criterion because the role, theme, is taken by a pro, whose existence can be proved by the properly bound reflexive pronoun se stessi. Compare (7a) with (7b) below: (7b) *Un bravo psicanalista può dare aiuto a se stessi. A good psychoanalyst can give help to oneself. 'A good psychoanalyst can give help to themselves'. (Adapted from ) When the reflexive pronoun se stessi 'themselves' doesn't have a proper antecedent to co-refer to, the