Mariano Velázquez de la Cadena, An Easy Introduction to Spanish Conversation
“ Me, te, se, le, los, la, las, les, are governed by verbs, and never placed after prepositions. When the verbs are in the indicative, or in the subjunctive mood, they are placed before the verb; as, He esteems her, él la estima. Should the verb be in the infinitive, or in the imperative mood, the pronouns must be placed after it, and joined to it so as to appear one word ”
