Queísmo

Queísmo is a phenomenon in Spanish grammar, the omission of a preposition, usually de, which, in Standard Spanish, would precede the conjunction (or complementizer) que. For example, "No me di cuenta que habías venido" ("I didn't realize you had come"): compare standard "No me di cuenta de que habías venido". Queísmo is frowned upon by prescriptive grammar.

Spanish language
A manuscript of the Cantar de mio Cid, 13th century
Overview
Pronunciation stress Orthography Names
History
Old Middle Influences
Grammar
Determiners Nouns gender Pronouns personal object Adjectives Prepositions Verbs conjugation irregular verbs
Dialects
Peninsular Pan-American Standard New Mexican Andean Rioplatense Chilean Castellano Judaeo-Spanish Yeísmo Loísmo Philippine
Dialectology
seseo yeísmo voseo leísmo loísmo
Interlanguages
Belgranodeutsch Llanito Portuñol Spanglish Castrapo Creoles Roquetas Pidgin Chavacano or Chabacano Palenquero or Palenque
Teaching
Hispanism RAE Instituto Cervantes

Although the omitted preposition is typically de, other prepositions occasionally are also subject to omission by queísmo: "Insisto que te vayas" ("I insist that you go"); compare standard "Insisto en que te vayas".

Queísmo may be, in some cases, a hypercorrective reaction to dequeísmo: the insertion of de before que where it would not appear in standard Spanish, which is considered a much more serious and socially stigmatized mistake, but which is nevertheless widespread in both Peninsular and American Spanish.