TY - JOUR AU - Marcela Luna Vizcaíno PY - 2017/07/03 Y2 - 2024/03/28 TI - Present Perfect JF - Boletín Científico de la Escuela Superior Atotonilco de Tula JA - ESAT VL - 4 IS - 8 SE - Resúmenes, mapas o diagramas de aplicación del conocimiento DO - 10.29057/esat.v4i8.2415 UR - https://repository.uaeh.edu.mx/revistas/index.php/atotonilco/article/view/2415 AB - The present perfect expresses actions that have started in the past and continued up to the present. The present concept map shows its uses, auxiliary, time expressions, verb form, contractions and structure. ER -