The differences between reflexive and non-reflexive verbs can be summarized by the following points:
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Reflexive verbs include a reflexive pronoun which must agree with the subject. (This is true for reflexive verbs, as the pronoun reflects the subject performing the action on themselves.)
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Reflexive verbs indicate that the subject (the "do-er" of the action) is also the "receiver" of the action. (This is the defining characteristic of reflexive verbs; the action is performed by the subject upon themselves.)
The other two statements are not universally true:
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Reflexive pronouns always come after the conjugated verb. (This is not entirely accurate; in many cases, the pronoun comes before the conjugated verb, especially in sentence constructions using auxiliary verbs or in the infinitive form.)
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Reflexive verbs always have a stem-change that occurs in the yo, tú, él/ella/usted, and ellos/ellas/ustedes forms. (This is not correct; while some reflexive verbs may have stem changes, not all reflexive verbs do.)
Therefore, the correct responses are:
- Reflexive verbs include a reflexive pronoun which must agree with the subject.
- Reflexive verbs indicate that the subject (the "do-er" of the action) is also the "receiver" of the action.